990243831 has 8 divisors (see below), whose sum is σ = 1365853680. Its totient is φ = 637398272.

The previous prime is 990243823. The next prime is 990243847. The reversal of 990243831 is 138342099.

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

It is a cyclic number.

It is not a de Polignac number, because 990243831 - 2³ = 990243823 is a prime.

It is a super-2 number, since 2×990243831² = 1961165689667113122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 990243831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990203831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5690970 + ... + 5691143.

It is an arithmetic number, because the mean of its divisors is an integer number (170731710).

Almost surely, 2^990243831 is an apocalyptic number.

990243831 is a deficient number, since it is larger than the sum of its proper divisors (375609849).

990243831 is a wasteful number, since it uses less digits than its factorization.

990243831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11382145.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 990243831 is about 31468.1399354967. The cubic root of 990243831 is about 996.7373100985.

The spelling of 990243831 in words is "nine hundred ninety million, two hundred forty-three thousand, eight hundred thirty-one".