252406137 has 4 divisors (see below), whose sum is σ = 336541520. Its totient is φ = 168270756.

The previous prime is 252406109. The next prime is 252406153. The reversal of 252406137 is 731604252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 252406137 - 2⁶ = 252406073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252401137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42067687 + ... + 42067692.

It is an arithmetic number, because the mean of its divisors is an integer number (84135380).

Almost surely, 2^252406137 is an apocalyptic number.

It is an amenable number.

252406137 is a deficient number, since it is larger than the sum of its proper divisors (84135383).

252406137 is an equidigital number, since it uses as much as digits as its factorization.

252406137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84135382.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 252406137 is about 15887.2948295171. The cubic root of 252406137 is about 631.9751040038.

The spelling of 252406137 in words is "two hundred fifty-two million, four hundred six thousand, one hundred thirty-seven".