1216235715 has 16 divisors (see below), whose sum is σ = 1946738688. Its totient is φ = 648405216.

The previous prime is 1216235707. The next prime is 1216235719. The reversal of 1216235715 is 5175326121.

It is not a de Polignac number, because 1216235715 - 2³ = 1216235707 is a prime.

It is a super-2 number, since 2×1216235715² = 2958458628883122450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1216235719) 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, 27582 + ... + 56508.

It is an arithmetic number, because the mean of its divisors is an integer number (121671168).

Almost surely, 2^1216235715 is an apocalyptic number.

1216235715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216235715 is a deficient number, since it is larger than the sum of its proper divisors (730502973).

1216235715 is a wasteful number, since it uses less digits than its factorization.

1216235715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31738.

The product of its digits is 12600, while the sum is 33.

The square root of 1216235715 is about 34874.5711801593. The cubic root of 1216235715 is about 1067.4296223898.

The spelling of 1216235715 in words is "one billion, two hundred sixteen million, two hundred thirty-five thousand, seven hundred fifteen".