16403616 has 36 divisors (see below), whose sum is σ = 46648602. Its totient is φ = 5467776.

The previous prime is 16403609. The next prime is 16403671. The reversal of 16403616 is 61630461.

16403616 is a `hidden beast` number, since 1 + 6 + 40 + 3 + 616 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15968016 + 435600 = 3996^2 + 660^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 16403616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28191 + ... + 28766.

Almost surely, 2^16403616 is an apocalyptic number.

16403616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16403616 is an abundant number, since it is smaller than the sum of its proper divisors (30244986).

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

16403616 is a wasteful number, since it uses less digits than its factorization.

16403616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56973 (or 56962 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 16403616 is about 4050.1377754343. The cubic root of 16403616 is about 254.0854900607.

The spelling of 16403616 in words is "sixteen million, four hundred three thousand, six hundred sixteen".