252640389 has 8 divisors (see below), whose sum is σ = 336929152. Its totient is φ = 168389280.

The previous prime is 252640387. The next prime is 252640391. The reversal of 252640389 is 983046252.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (252640387) and next prime (252640391).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 252640389 - 2¹ = 252640387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252640387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16212 + ... + 27714.

It is an arithmetic number, because the mean of its divisors is an integer number (42116144).

Almost surely, 2^252640389 is an apocalyptic number.

It is an amenable number.

252640389 is a deficient number, since it is larger than the sum of its proper divisors (84288763).

252640389 is a wasteful number, since it uses less digits than its factorization.

252640389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18827.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 252640389 is about 15894.6654258591. The cubic root of 252640389 is about 632.1705504637.

The spelling of 252640389 in words is "two hundred fifty-two million, six hundred forty thousand, three hundred eighty-nine".