16404155 has 16 divisors (see below), whose sum is σ = 20109600. Its totient is φ = 12844032.

The previous prime is 16404139. The next prime is 16404161. The reversal of 16404155 is 55140461.

It is a cyclic number.

It is not a de Polignac number, because 16404155 - 2⁴ = 16404139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72152 + ... + 72378.

It is an arithmetic number, because the mean of its divisors is an integer number (1256850).

Almost surely, 2^16404155 is an apocalyptic number.

16404155 is a deficient number, since it is larger than the sum of its proper divisors (3705445).

16404155 is a wasteful number, since it uses less digits than its factorization.

16404155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 16404155 is about 4050.2043158340. The cubic root of 16404155 is about 254.0882729954.

The spelling of 16404155 in words is "sixteen million, four hundred four thousand, one hundred fifty-five".