125205138 has 12 divisors (see below), whose sum is σ = 271277838. Its totient is φ = 41735040.

The previous prime is 125205137. The next prime is 125205167. The reversal of 125205138 is 831502521.

It is a happy number.

125205138 is a `hidden beast` number, since 1 + 2 + 520 + 5 + 138 = 666.

It can be written as a sum of positive squares in only one way, i.e., 125148969 + 56169 = 11187^2 + 237^2 .

It is not an unprimeable number, because it can be changed into a prime (125205137) 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, 3477903 + ... + 3477938.

Almost surely, 2^125205138 is an apocalyptic number.

125205138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

125205138 is an abundant number, since it is smaller than the sum of its proper divisors (146072700).

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

125205138 is a wasteful number, since it uses less digits than its factorization.

125205138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6955849 (or 6955846 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 125205138 is about 11189.5101769470. The cubic root of 125205138 is about 500.2733678461.

Adding to 125205138 its reverse (831502521), we get a palindrome (956707659).

The spelling of 125205138 in words is "one hundred twenty-five million, two hundred five thousand, one hundred thirty-eight".