990965923 has 4 divisors (see below), whose sum is σ = 1007211328. Its totient is φ = 974720520.

The previous prime is 990965903. The next prime is 990965929. The reversal of 990965923 is 329569099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 990965923 - 2⁵ = 990965891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990965929) 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, 8122611 + ... + 8122732.

It is an arithmetic number, because the mean of its divisors is an integer number (251802832).

Almost surely, 2^990965923 is an apocalyptic number.

990965923 is a deficient number, since it is larger than the sum of its proper divisors (16245405).

990965923 is a wasteful number, since it uses less digits than its factorization.

990965923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16245404.

The product of its (nonzero) digits is 1180980, while the sum is 52.

The square root of 990965923 is about 31479.6112269513. The cubic root of 990965923 is about 996.9795269279.

The spelling of 990965923 in words is "nine hundred ninety million, nine hundred sixty-five thousand, nine hundred twenty-three".