16491864 has 16 divisors (see below), whose sum is σ = 41229720. Its totient is φ = 5497280.

The previous prime is 16491859. The next prime is 16491883. The reversal of 16491864 is 46819461.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343557 + ... + 343604.

Almost surely, 2^16491864 is an apocalyptic number.

It is an amenable number.

16491864 is an abundant number, since it is smaller than the sum of its proper divisors (24737856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16491864 is a wasteful number, since it uses less digits than its factorization.

16491864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687170 (or 687166 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 16491864 is about 4061.0176064627. The cubic root of 16491864 is about 254.5403175525.

The spelling of 16491864 in words is "sixteen million, four hundred ninety-one thousand, eight hundred sixty-four".