18870725 has 6 divisors (see below), whose sum is σ = 23399730. Its totient is φ = 15096560.

The previous prime is 18870721. The next prime is 18870727. The reversal of 18870725 is 52707881.

It can be written as a sum of positive squares in 3 ways, for example, as 2982529 + 15888196 = 1727^2 + 3986^2 .

It is not a de Polignac number, because 18870725 - 2² = 18870721 is a prime.

It is a super-2 number, since 2×18870725² = 712208524051250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 377390 + ... + 377439.

It is an arithmetic number, because the mean of its divisors is an integer number (3899955).

Almost surely, 2^18870725 is an apocalyptic number.

It is an amenable number.

18870725 is a deficient number, since it is larger than the sum of its proper divisors (4529005).

18870725 is an equidigital number, since it uses as much as digits as its factorization.

18870725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754839 (or 754834 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 18870725 is about 4344.0447741707. The cubic root of 18870725 is about 266.2335982902.

The spelling of 18870725 in words is "eighteen million, eight hundred seventy thousand, seven hundred twenty-five".