9918725 has 12 divisors (see below), whose sum is σ = 12724260. Its totient is φ = 7660800.

The previous prime is 9918721. The next prime is 9918743. The reversal of 9918725 is 5278199.

It can be written as a sum of positive squares in 6 ways, for example, as 178084 + 9740641 = 422^2 + 3121^2 .

It is not a de Polignac number, because 9918725 - 2² = 9918721 is a prime.

It is a super-2 number, since 2×9918725² = 196762211251250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9918721) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 6116 + ... + 7565.

It is an arithmetic number, because the mean of its divisors is an integer number (1060355).

Almost surely, 2^9918725 is an apocalyptic number.

It is an amenable number.

9918725 is a deficient number, since it is larger than the sum of its proper divisors (2805535).

9918725 is a wasteful number, since it uses less digits than its factorization.

9918725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13720 (or 13715 counting only the distinct ones).

The product of its digits is 45360, while the sum is 41.

The square root of 9918725 is about 3149.4007366482. The cubic root of 9918725 is about 214.8582082942.

It can be divided in two parts, 99 and 18725, that multiplied together give a triangular number (1853775 = T₁₉₂₅).

The spelling of 9918725 in words is "nine million, nine hundred eighteen thousand, seven hundred twenty-five".