16321725 has 72 divisors (see below), whose sum is σ = 34329152. Its totient is φ = 7257600.

The previous prime is 16321691. The next prime is 16321729. The reversal of 16321725 is 52712361.

It is a happy number.

16321725 is a `hidden beast` number, since 1 + 632 + 1 + 7 + 25 = 666.

It is not a de Polignac number, because 16321725 - 2¹⁵ = 16288957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16321729) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 67605 + ... + 67845.

Almost surely, 2^16321725 is an apocalyptic number.

16321725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16321725 is an abundant number, since it is smaller than the sum of its proper divisors (18007427).

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

16321725 is a wasteful number, since it uses less digits than its factorization.

16321725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 299 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 16321725 is about 4040.0154702674. The cubic root of 16321725 is about 253.6619648179.

The spelling of 16321725 in words is "sixteen million, three hundred twenty-one thousand, seven hundred twenty-five".