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999999669 = 3333333223
BaseRepresentation
bin111011100110101…
…100100010110101
32120200200020122210
4323212230202311
54021444442134
6243121244033
733531566634
oct7346544265
92520606583
10999999669
11473523609
1223aa93619
1312c239ca6
1496b4b51b
155cbd12e9
hex3b9ac8b5

999999669 has 4 divisors (see below), whose sum is σ = 1333332896. Its totient is φ = 666666444.

The previous prime is 999999667. The next prime is 999999677. The reversal of 999999669 is 966999999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 999999669 - 21 = 999999667 is a prime.

It is a super-2 number, since 2×9999996692 = 1999998676000219122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999999669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166666609 + ... + 166666614.

It is an arithmetic number, because the mean of its divisors is an integer number (333333224).

Almost surely, 2999999669 is an apocalyptic number.

It is an amenable number.

999999669 is a deficient number, since it is larger than the sum of its proper divisors (333333227).

999999669 is a wasteful number, since it uses less digits than its factorization.

999999669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333333226.

The product of its digits is 172186884, while the sum is 75.

The square root of 999999669 is about 31622.7713681138. The cubic root of 999999669 is about 999.9998896667. Note that the first 3 decimals are identical.

The spelling of 999999669 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred sixty-nine".

Divisors: 1 3 333333223 999999669