16402725 has 18 divisors (see below), whose sum is σ = 29379506. Its totient is φ = 8748000.

The previous prime is 16402723. The next prime is 16402733. The reversal of 16402725 is 52720461.

16402725 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 3 ways, for example, as 5846724 + 10556001 = 2418^2 + 3249^2 .

It is not a de Polignac number, because 16402725 - 2¹ = 16402723 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16402721) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 36226 + ... + 36675.

Almost surely, 2^16402725 is an apocalyptic number.

16402725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16402725 is a deficient number, since it is larger than the sum of its proper divisors (12976781).

16402725 is a wasteful number, since it uses less digits than its factorization.

16402725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72917 (or 72909 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 16402725 is about 4050.0277776825. The cubic root of 16402725 is about 254.0808895654.

The spelling of 16402725 in words is "sixteen million, four hundred two thousand, seven hundred twenty-five".