252661407 has 4 divisors (see below), whose sum is σ = 336881880. Its totient is φ = 168440936.

The previous prime is 252661399. The next prime is 252661433. The reversal of 252661407 is 704166252.

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

It is a cyclic number.

It is not a de Polignac number, because 252661407 - 2³ = 252661399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252661907) 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, 42110232 + ... + 42110237.

It is an arithmetic number, because the mean of its divisors is an integer number (84220470).

Almost surely, 2^252661407 is an apocalyptic number.

252661407 is a deficient number, since it is larger than the sum of its proper divisors (84220473).

252661407 is an equidigital number, since it uses as much as digits as its factorization.

252661407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84220472.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 252661407 is about 15895.3265773308. The cubic root of 252661407 is about 632.1880807726.

The spelling of 252661407 in words is "two hundred fifty-two million, six hundred sixty-one thousand, four hundred seven".