16438732431 has 32 divisors (see below), whose sum is σ = 25179517440. Its totient is φ = 9442224000.

The previous prime is 16438732423. The next prime is 16438732433. The reversal of 16438732431 is 13423783461.

It is not a de Polignac number, because 16438732431 - 2³ = 16438732423 is a prime.

It is a super-2 number, since 2×16438732431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16438732433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16620 + ... + 182081.

It is an arithmetic number, because the mean of its divisors is an integer number (786859920).

Almost surely, 2^16438732431 is an apocalyptic number.

16438732431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16438732431 is a deficient number, since it is larger than the sum of its proper divisors (8740785009).

16438732431 is a wasteful number, since it uses less digits than its factorization.

16438732431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198847.

The product of its digits is 290304, while the sum is 42.

The spelling of 16438732431 in words is "sixteen billion, four hundred thirty-eight million, seven hundred thirty-two thousand, four hundred thirty-one".