252307138 has 4 divisors (see below), whose sum is σ = 378460710. Its totient is φ = 126153568.

The previous prime is 252307127. The next prime is 252307141. The reversal of 252307138 is 831703252.

252307138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 169078009 + 83229129 = 13003^2 + 9123^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63076783 + ... + 63076786.

Almost surely, 2^252307138 is an apocalyptic number.

252307138 is a deficient number, since it is larger than the sum of its proper divisors (126153572).

252307138 is a wasteful number, since it uses less digits than its factorization.

252307138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126153571.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 252307138 is about 15884.1788582224. The cubic root of 252307138 is about 631.8924685529.

The spelling of 252307138 in words is "two hundred fifty-two million, three hundred seven thousand, one hundred thirty-eight".