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669899 = 4116339
BaseRepresentation
bin10100011100011001011
31021000221002
42203203023
5132414044
622205215
75460026
oct2434313
91230832
10669899
1141833a
1228380b
131a5bb9
141361bd
15d374e
hexa38cb

669899 has 4 divisors (see below), whose sum is σ = 686280. Its totient is φ = 653520.

The previous prime is 669887. The next prime is 669901. The reversal of 669899 is 998966.

It is a happy number.

669899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998966 = 2499483.

It is a cyclic number.

It is not a de Polignac number, because 669899 - 212 = 665803 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669899.

It is not an unprimeable number, because it can be changed into a prime (669839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8129 + ... + 8210.

It is an arithmetic number, because the mean of its divisors is an integer number (171570).

2669899 is an apocalyptic number.

669899 is a deficient number, since it is larger than the sum of its proper divisors (16381).

669899 is a wasteful number, since it uses less digits than its factorization.

669899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16380.

The product of its digits is 209952, while the sum is 47.

The square root of 669899 is about 818.4735792926. The cubic root of 669899 is about 87.4990040703.

The spelling of 669899 in words is "six hundred sixty-nine thousand, eight hundred ninety-nine".

Divisors: 1 41 16339 669899