16402131 has 12 divisors (see below), whose sum is σ = 24456640. Its totient is φ = 10581840.

The previous prime is 16402129. The next prime is 16402147. The reversal of 16402131 is 13120461.

It is a happy number.

16402131 is a `hidden beast` number, since 1 + 640 + 21 + 3 + 1 = 666.

It is not a de Polignac number, because 16402131 - 2¹ = 16402129 is a prime.

It is a super-2 number, since 2×16402131² = 538059802682322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16402121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29116 + ... + 29673.

Almost surely, 2^16402131 is an apocalyptic number.

16402131 is a deficient number, since it is larger than the sum of its proper divisors (8054509).

16402131 is a wasteful number, since it uses less digits than its factorization.

16402131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58826 (or 58823 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 16402131 is about 4049.9544441882. The cubic root of 16402131 is about 254.0778224761.

Adding to 16402131 its reverse (13120461), we get a palindrome (29522592).

The spelling of 16402131 in words is "sixteen million, four hundred two thousand, one hundred thirty-one".