1252442520 has 128 divisors (see below), whose sum is σ = 4771238400. Its totient is φ = 286270848.

The previous prime is 1252442509. The next prime is 1252442533. The reversal of 1252442520 is 252442521.

It is a super-2 number, since 2×1252442520² = 3137224531807900800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75274 + ... + 90393.

It is an arithmetic number, because the mean of its divisors is an integer number (37275300).

Almost surely, 2^1252442520 is an apocalyptic number.

1252442520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1252442520 is an abundant number, since it is smaller than the sum of its proper divisors (3518795880).

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

1252442520 is a wasteful number, since it uses less digits than its factorization.

1252442520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165694 (or 165684 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 1252442520 is about 35389.8646507725. The cubic root of 1252442520 is about 1077.9185218197.

Subtracting from 1252442520 its reverse (252442521), we obtain a palindrome (999999999).

The spelling of 1252442520 in words is "one billion, two hundred fifty-two million, four hundred forty-two thousand, five hundred twenty".