16465138 has 4 divisors (see below), whose sum is σ = 24697710. Its totient is φ = 8232568.

The previous prime is 16465093. The next prime is 16465151. The reversal of 16465138 is 83156461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83156461 = 2221 ⋅37441.

It can be written as a sum of positive squares in only one way, i.e., 14115049 + 2350089 = 3757^2 + 1533^2 .

It is a super-2 number, since 2×16465138² = 542201538718088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4116283 + ... + 4116286.

Almost surely, 2^16465138 is an apocalyptic number.

16465138 is a deficient number, since it is larger than the sum of its proper divisors (8232572).

16465138 is an equidigital number, since it uses as much as digits as its factorization.

16465138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8232571.

The product of its digits is 17280, while the sum is 34.

The square root of 16465138 is about 4057.7257176897. The cubic root of 16465138 is about 254.4027442085.

The spelling of 16465138 in words is "sixteen million, four hundred sixty-five thousand, one hundred thirty-eight".