16404440 has 32 divisors (see below), whose sum is σ = 39750480. Its totient is φ = 6056832.

The previous prime is 16404413. The next prime is 16404449. The reversal of 16404440 is 4440461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16404449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15254 + ... + 16293.

Almost surely, 2^16404440 is an apocalyptic number.

16404440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16404440 is an abundant number, since it is smaller than the sum of its proper divisors (23346040).

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

16404440 is a wasteful number, since it uses less digits than its factorization.

16404440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31571 (or 31567 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 16404440 is about 4050.2394990914. The cubic root of 16404440 is about 254.0897444669.

The spelling of 16404440 in words is "sixteen million, four hundred four thousand, four hundred forty".