16399423924 has 48 divisors (see below), whose sum is σ = 31242556800. Its totient is φ = 7486865280.

The previous prime is 16399423897. The next prime is 16399423927. The reversal of 16399423924 is 42932499361.

It is a happy number.

It is a super-2 number, since 2×16399423924² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16399423927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8413302 + ... + 8415250.

It is an arithmetic number, because the mean of its divisors is an integer number (650886600).

Almost surely, 2^16399423924 is an apocalyptic number.

It is an amenable number.

16399423924 is a deficient number, since it is larger than the sum of its proper divisors (14843132876).

16399423924 is a wasteful number, since it uses less digits than its factorization.

16399423924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640 (or 3638 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 52.

The spelling of 16399423924 in words is "sixteen billion, three hundred ninety-nine million, four hundred twenty-three thousand, nine hundred twenty-four".