16491400 has 24 divisors (see below), whose sum is σ = 38342970. Its totient is φ = 6596480.

The previous prime is 16491379. The next prime is 16491443. The reversal of 16491400 is 419461.

It can be written as a sum of positive squares in 3 ways, for example, as 11410884 + 5080516 = 3378^2 + 2254^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41029 + ... + 41428.

Almost surely, 2^16491400 is an apocalyptic number.

16491400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16491400 is an abundant number, since it is smaller than the sum of its proper divisors (21851570).

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

16491400 is a wasteful number, since it uses less digits than its factorization.

16491400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82473 (or 82464 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 16491400 is about 4060.9604775225. The cubic root of 16491400 is about 254.5379303589.

The spelling of 16491400 in words is "sixteen million, four hundred ninety-one thousand, four hundred".