1252423636 has 6 divisors (see below), whose sum is σ = 2191741370. Its totient is φ = 626211816.

The previous prime is 1252423583. The next prime is 1252423637. The reversal of 1252423636 is 6363242521.

It can be written as a sum of positive squares in only one way, i.e., 949872400 + 302551236 = 30820^2 + 17394^2 .

It is a super-2 number, since 2×1252423636² = 3137129928022920992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252423637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156552951 + ... + 156552958.

Almost surely, 2^1252423636 is an apocalyptic number.

It is an amenable number.

1252423636 is a deficient number, since it is larger than the sum of its proper divisors (939317734).

1252423636 is a wasteful number, since it uses less digits than its factorization.

1252423636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313105913 (or 313105911 counting only the distinct ones).

The product of its digits is 51840, while the sum is 34.

The square root of 1252423636 is about 35389.5978502158. The cubic root of 1252423636 is about 1077.9131042682.

The spelling of 1252423636 in words is "one billion, two hundred fifty-two million, four hundred twenty-three thousand, six hundred thirty-six".