1213860636 has 18 divisors (see below), whose sum is σ = 3068370032. Its totient is φ = 404620200.

The previous prime is 1213860629. The next prime is 1213860671. The reversal of 1213860636 is 6360683121.

1213860636 is a `hidden beast` number, since 1 + 2 + 13 + 8 + 6 + 0 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 33718351 = 1213860636 / (1 + 2 + 1 + 3 + 8 + 6 + 0 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 1213860636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16859140 + ... + 16859211.

Almost surely, 2^1213860636 is an apocalyptic number.

It is an amenable number.

1213860636 is an abundant number, since it is smaller than the sum of its proper divisors (1854509396).

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

1213860636 is a wasteful number, since it uses less digits than its factorization.

1213860636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33718361 (or 33718356 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 1213860636 is about 34840.5028092305. The cubic root of 1213860636 is about 1066.7343400207.

The spelling of 1213860636 in words is "one billion, two hundred thirteen million, eight hundred sixty thousand, six hundred thirty-six".