252399989 has 4 divisors (see below), whose sum is σ = 252468780. Its totient is φ = 252331200.

The previous prime is 252399967. The next prime is 252399997. The reversal of 252399989 is 989993252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 200703889 + 51696100 = 14167^2 + 7190^2 .

It is a cyclic number.

It is not a de Polignac number, because 252399989 - 2⁸ = 252399733 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 (252390989) 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, 28562 + ... + 36339.

It is an arithmetic number, because the mean of its divisors is an integer number (63117195).

Almost surely, 2^252399989 is an apocalyptic number.

It is an amenable number.

252399989 is a deficient number, since it is larger than the sum of its proper divisors (68791).

252399989 is an equidigital number, since it uses as much as digits as its factorization.

252399989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68790.

The product of its digits is 3149280, while the sum is 56.

The square root of 252399989 is about 15887.1013403956. The cubic root of 252399989 is about 631.9699728363.

The spelling of 252399989 in words is "two hundred fifty-two million, three hundred ninety-nine thousand, nine hundred eighty-nine".