1216872807 has 4 divisors (see below), whose sum is σ = 1622497080. Its totient is φ = 811248536.

The previous prime is 1216872793. The next prime is 1216872809. The reversal of 1216872807 is 7082786121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1216872807 - 2²⁸ = 948437351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216872809) 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, 202812132 + ... + 202812137.

It is an arithmetic number, because the mean of its divisors is an integer number (405624270).

Almost surely, 2^1216872807 is an apocalyptic number.

1216872807 is a deficient number, since it is larger than the sum of its proper divisors (405624273).

1216872807 is an equidigital number, since it uses as much as digits as its factorization.

1216872807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405624272.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 1216872807 is about 34883.7040321122. The cubic root of 1216872807 is about 1067.6159711809.

The spelling of 1216872807 in words is "one billion, two hundred sixteen million, eight hundred seventy-two thousand, eight hundred seven".