1213857867 has 16 divisors (see below), whose sum is σ = 1697614848. Its totient is φ = 770035200.

The previous prime is 1213857863. The next prime is 1213857871. The reversal of 1213857867 is 7687583121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1213857863) and next prime (1213857871).

It is not a de Polignac number, because 1213857867 - 2² = 1213857863 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 32259 + ... + 58892.

It is an arithmetic number, because the mean of its divisors is an integer number (106100928).

Almost surely, 2^1213857867 is an apocalyptic number.

1213857867 is a deficient number, since it is larger than the sum of its proper divisors (483756981).

1213857867 is a wasteful number, since it uses less digits than its factorization.

1213857867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91370.

The product of its digits is 564480, while the sum is 48.

The square root of 1213857867 is about 34840.4630709754. The cubic root of 1213857867 is about 1066.7335288925.

The spelling of 1213857867 in words is "one billion, two hundred thirteen million, eight hundred fifty-seven thousand, eight hundred sixty-seven".