252139939 has 2 divisors, whose sum is σ = 252139940. Its totient is φ = 252139938.

The previous prime is 252139933. The next prime is 252139997. The reversal of 252139939 is 939931252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 252139939 - 2³ = 252139931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 252139895 and 252139904.

It is not a weakly prime, because it can be changed into another prime (252139931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126069969 + 126069970.

It is an arithmetic number, because the mean of its divisors is an integer number (126069970).

Almost surely, 2^252139939 is an apocalyptic number.

252139939 is a deficient number, since it is larger than the sum of its proper divisors (1).

252139939 is an equidigital number, since it uses as much as digits as its factorization.

252139939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 43.

The square root of 252139939 is about 15878.9149188476. The cubic root of 252139939 is about 631.7528567870.

The spelling of 252139939 in words is "two hundred fifty-two million, one hundred thirty-nine thousand, nine hundred thirty-nine".