1216436620 has 48 divisors (see below), whose sum is σ = 3073109760. Its totient is φ = 395112384.

The previous prime is 1216436591. The next prime is 1216436623. The reversal of 1216436620 is 266346121.

It is not an unprimeable number, because it can be changed into a prime (1216436623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225994 + ... + 231313.

It is an arithmetic number, because the mean of its divisors is an integer number (64023120).

Almost surely, 2^1216436620 is an apocalyptic number.

1216436620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216436620 is an abundant number, since it is smaller than the sum of its proper divisors (1856673140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216436620 is a wasteful number, since it uses less digits than its factorization.

1216436620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457342 (or 457340 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1216436620 is about 34877.4514550590. The cubic root of 1216436620 is about 1067.4883939307.

It can be divided in two parts, 12164 and 36620, that added together give a palindrome (48784).

The spelling of 1216436620 in words is "one billion, two hundred sixteen million, four hundred thirty-six thousand, six hundred twenty".