188139625 has 8 divisors (see below), whose sum is σ = 234798408. Its totient is φ = 150511600.

The previous prime is 188139619. The next prime is 188139631. The reversal of 188139625 is 526931881.

188139625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (188139619) and next prime (188139631).

It can be written as a sum of positive squares in 4 ways, for example, as 60652944 + 127486681 = 7788^2 + 11291^2 .

It is not a de Polignac number, because 188139625 - 2⁵ = 188139593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 752434 + ... + 752683.

It is an arithmetic number, because the mean of its divisors is an integer number (29349801).

Almost surely, 2^188139625 is an apocalyptic number.

It is an amenable number.

188139625 is a deficient number, since it is larger than the sum of its proper divisors (46658783).

188139625 is an equidigital number, since it uses as much as digits as its factorization.

188139625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505132 (or 1505122 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 188139625 is about 13716.3998556473. The cubic root of 188139625 is about 573.0072162480.

The spelling of 188139625 in words is "one hundred eighty-eight million, one hundred thirty-nine thousand, six hundred twenty-five".