1216936857 has 8 divisors (see below), whose sum is σ = 1718028576. Its totient is φ = 763568192.

The previous prime is 1216936843. The next prime is 1216936859. The reversal of 1216936857 is 7586396121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216936857 - 2⁷ = 1216936729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216936859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11930703 + ... + 11930804.

It is an arithmetic number, because the mean of its divisors is an integer number (214753572).

Almost surely, 2^1216936857 is an apocalyptic number.

1216936857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1216936857 is a deficient number, since it is larger than the sum of its proper divisors (501091719).

1216936857 is a wasteful number, since it uses less digits than its factorization.

1216936857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23861527.

The product of its digits is 544320, while the sum is 48.

The square root of 1216936857 is about 34884.6220704768. The cubic root of 1216936857 is about 1067.6347021452.

The spelling of 1216936857 in words is "one billion, two hundred sixteen million, nine hundred thirty-six thousand, eight hundred fifty-seven".