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9990231 = 317319249
BaseRepresentation
bin100110000111…
…000001010111
3200210120000120
4212013001113
510024141411
6554043023
7150626016
oct46070127
920716016
109990231
115703899
123419473
1320ba2a4
141480a7d
15d25106
hex987057

9990231 has 8 divisors (see below), whose sum is σ = 13398000. Its totient is φ = 6621312.

The previous prime is 9990221. The next prime is 9990251. The reversal of 9990231 is 1320999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9990231 - 223 = 1601623 is a prime.

It is a super-2 number, since 2×99902312 = 199609430866722, which contains 22 as substring.

It is a d-powerful number, because it can be written as 9 + 93 + 94 + 0 + 223 + 313 + 1 .

9990231 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 9990192 and 9990201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9106 + ... + 10143.

It is an arithmetic number, because the mean of its divisors is an integer number (1674750).

Almost surely, 29990231 is an apocalyptic number.

9990231 is a deficient number, since it is larger than the sum of its proper divisors (3407769).

9990231 is a wasteful number, since it uses less digits than its factorization.

9990231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19425.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 9990231 is about 3160.7326682274. The cubic root of 9990231 is about 215.3732905708.

The spelling of 9990231 in words is "nine million, nine hundred ninety thousand, two hundred thirty-one".

Divisors: 1 3 173 519 19249 57747 3330077 9990231