1240536636 has 72 divisors (see below), whose sum is σ = 3178833840. Its totient is φ = 407879424.

The previous prime is 1240536611. The next prime is 1240536667. The reversal of 1240536636 is 6366350421.

1240536636 is a `hidden beast` number, since 12 + 4 + 0 + 5 + 3 + 6 + 636 = 666.

It is a super-2 number, since 2×1240536636² = 3077862290516392992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1240536636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 864976 + ... + 866408.

It is an arithmetic number, because the mean of its divisors is an integer number (44150470).

Almost surely, 2^1240536636 is an apocalyptic number.

It is an amenable number.

1240536636 is an abundant number, since it is smaller than the sum of its proper divisors (1938297204).

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

1240536636 is a wasteful number, since it uses less digits than its factorization.

1240536636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755 (or 1750 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 1240536636 is about 35221.2526182701. The cubic root of 1240536636 is about 1074.4920292686.

The spelling of 1240536636 in words is "one billion, two hundred forty million, five hundred thirty-six thousand, six hundred thirty-six".