252423636 has 12 divisors (see below), whose sum is σ = 588988512. Its totient is φ = 84141208.

The previous prime is 252423557. The next prime is 252423637. The reversal of 252423636 is 636324252.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×252423636² = 127435384022920992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 252423597 and 252423606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252423637) 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, 10517640 + ... + 10517663.

It is an arithmetic number, because the mean of its divisors is an integer number (49082376).

Almost surely, 2^252423636 is an apocalyptic number.

It is an amenable number.

252423636 is an abundant number, since it is smaller than the sum of its proper divisors (336564876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

252423636 is a wasteful number, since it uses less digits than its factorization.

252423636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21035310 (or 21035308 counting only the distinct ones).

The product of its digits is 51840, while the sum is 33.

The square root of 252423636 is about 15887.8455430559. The cubic root of 252423636 is about 631.9897083460.

Adding to 252423636 its reverse (636324252), we get a palindrome (888747888).

The spelling of 252423636 in words is "two hundred fifty-two million, four hundred twenty-three thousand, six hundred thirty-six".