6390999923 has 32 divisors (see below), whose sum is σ = 8396352000. Its totient is φ = 4712843520.

The previous prime is 6390999883. The next prime is 6390999971. The reversal of 6390999923 is 3299990936.

It is not a de Polignac number, because 6390999923 - 2¹⁴ = 6390983539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6390999983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1884113 + ... + 1887501.

It is an arithmetic number, because the mean of its divisors is an integer number (262386000).

Almost surely, 2^6390999923 is an apocalyptic number.

6390999923 is a deficient number, since it is larger than the sum of its proper divisors (2005352077).

6390999923 is a wasteful number, since it uses less digits than its factorization.

6390999923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4715.

The product of its (nonzero) digits is 6377292, while the sum is 59.

The square root of 6390999923 is about 79943.7297291038. The cubic root of 6390999923 is about 1855.7648198148.

The spelling of 6390999923 in words is "six billion, three hundred ninety million, nine hundred ninety-nine thousand, nine hundred twenty-three".