16555404 has 48 divisors (see below), whose sum is σ = 40410720. Its totient is φ = 5268480.

The previous prime is 16555397. The next prime is 16555411. The reversal of 16555404 is 40455561.

It is an interprime number because it is at equal distance from previous prime (16555397) and next prime (16555411).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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, 39114 + ... + 39534.

It is an arithmetic number, because the mean of its divisors is an integer number (841890).

Almost surely, 2^16555404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16555404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20205360).

16555404 is an abundant number, since it is smaller than the sum of its proper divisors (23855316).

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

16555404 is a wasteful number, since it uses less digits than its factorization.

16555404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 16555404 is about 4068.8332479963. The cubic root of 16555404 is about 254.8667970214.

The spelling of 16555404 in words is "sixteen million, five hundred fifty-five thousand, four hundred four".