1213857868 has 12 divisors (see below), whose sum is σ = 2249207352. Its totient is φ = 571227200.

The previous prime is 1213857863. The next prime is 1213857871. The reversal of 1213857868 is 8687583121.

It is not an unprimeable number, because it can be changed into a prime (1213857863) 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, 8925358 + ... + 8925493.

It is an arithmetic number, because the mean of its divisors is an integer number (187433946).

Almost surely, 2^1213857868 is an apocalyptic number.

It is an amenable number.

1213857868 is a deficient number, since it is larger than the sum of its proper divisors (1035349484).

1213857868 is a wasteful number, since it uses less digits than its factorization.

1213857868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17850872 (or 17850870 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 1213857868 is about 34840.4630853265. The cubic root of 1213857868 is about 1066.7335291855.

The spelling of 1213857868 in words is "one billion, two hundred thirteen million, eight hundred fifty-seven thousand, eight hundred sixty-eight".