252440013 has 24 divisors (see below), whose sum is σ = 394558560. Its totient is φ = 143139360.

The previous prime is 252440009. The next prime is 252440017. The reversal of 252440013 is 310044252.

It is an interprime number because it is at equal distance from previous prime (252440009) and next prime (252440017).

It is not a de Polignac number, because 252440013 - 2² = 252440009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252440017) 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, 12703 + ... + 25811.

It is an arithmetic number, because the mean of its divisors is an integer number (16439940).

Almost surely, 2^252440013 is an apocalyptic number.

It is an amenable number.

252440013 is a deficient number, since it is larger than the sum of its proper divisors (142118547).

252440013 is a wasteful number, since it uses less digits than its factorization.

252440013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13257 (or 13250 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 252440013 is about 15888.3609286798. The cubic root of 252440013 is about 632.0033756763.

Adding to 252440013 its reverse (310044252), we get a palindrome (562484265).

The spelling of 252440013 in words is "two hundred fifty-two million, four hundred forty thousand, thirteen".