9900831 has 8 divisors (see below), whose sum is σ = 13296640. Its totient is φ = 6552792.

The previous prime is 9900827. The next prime is 9900857. The reversal of 9900831 is 1380099.

It is a happy number.

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

It is not a de Polignac number, because 9900831 - 2² = 9900827 is a prime.

It is a super-2 number, since 2×9900831² = 196052908981122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11455 + ... + 12288.

It is an arithmetic number, because the mean of its divisors is an integer number (1662080).

Almost surely, 2^9900831 is an apocalyptic number.

9900831 is a deficient number, since it is larger than the sum of its proper divisors (3395809).

9900831 is a wasteful number, since it uses less digits than its factorization.

9900831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23885.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 9900831 is about 3146.5585963080. The cubic root of 9900831 is about 214.7289246376.

It can be divided in two parts, 9900 and 831, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 9900831 in words is "nine million, nine hundred thousand, eight hundred thirty-one".