1252625139 has 24 divisors (see below), whose sum is σ = 1830956400. Its totient is φ = 825151488.

The previous prime is 1252625137. The next prime is 1252625147. The reversal of 1252625139 is 9315262521.

It is a happy number.

1252625139 is a `hidden beast` number, since 1 + 25 + 2 + 625 + 1 + 3 + 9 = 666.

It is not a de Polignac number, because 1252625139 - 2¹ = 1252625137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1252625137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 430939 + ... + 433835.

It is an arithmetic number, because the mean of its divisors is an integer number (76289850).

Almost surely, 2^1252625139 is an apocalyptic number.

1252625139 is a deficient number, since it is larger than the sum of its proper divisors (578331261).

1252625139 is a wasteful number, since it uses less digits than its factorization.

1252625139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3459 (or 3456 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 1252625139 is about 35392.4446598423. Note that the first 3 decimals coincide. The cubic root of 1252625139 is about 1077.9709098090.

The spelling of 1252625139 in words is "one billion, two hundred fifty-two million, six hundred twenty-five thousand, one hundred thirty-nine".