16404840 has 48 divisors (see below), whose sum is σ = 53316900. Its totient is φ = 4374528.

The previous prime is 16404821. The next prime is 16404841. The reversal of 16404840 is 4840461.

16404840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15729156 + 675684 = 3966^2 + 822^2 .

It is not an unprimeable number, because it can be changed into a prime (16404841) 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, 22425 + ... + 23144.

Almost surely, 2^16404840 is an apocalyptic number.

16404840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16404840 is an abundant number, since it is smaller than the sum of its proper divisors (36912060).

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

16404840 is a wasteful number, since it uses less digits than its factorization.

16404840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45586 (or 45579 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 16404840 is about 4050.2888785863. The cubic root of 16404840 is about 254.0918096613.

The spelling of 16404840 in words is "sixteen million, four hundred four thousand, eight hundred forty".