16840400 has 30 divisors (see below), whose sum is σ = 40460022. Its totient is φ = 6736000.

The previous prime is 16840399. The next prime is 16840433. The reversal of 16840400 is 404861.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2521744 + 14318656 = 1588^2 + 3784^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20651 + ... + 21450.

Almost surely, 2^16840400 is an apocalyptic number.

16840400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16840400 is an abundant number, since it is smaller than the sum of its proper divisors (23619622).

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

16840400 is a wasteful number, since it uses less digits than its factorization.

16840400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42119 (or 42108 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 16840400 is about 4103.7056424651. The cubic root of 16840400 is about 256.3209678512.

The spelling of 16840400 in words is "sixteen million, eight hundred forty thousand, four hundred".