1216944972 has 72 divisors (see below), whose sum is σ = 3208981776. Its totient is φ = 403247808.

The previous prime is 1216944961. The next prime is 1216944977. The reversal of 1216944972 is 2794496121.

It is not an unprimeable number, because it can be changed into a prime (1216944977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164538 + ... + 171774.

Almost surely, 2^1216944972 is an apocalyptic number.

1216944972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216944972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1604490888).

1216944972 is an abundant number, since it is smaller than the sum of its proper divisors (1992036804).

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

1216944972 is a wasteful number, since it uses less digits than its factorization.

1216944972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7429 (or 7415 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1216944972 is about 34884.7383822783. The cubic root of 1216944972 is about 1067.6370752720.

The spelling of 1216944972 in words is "one billion, two hundred sixteen million, nine hundred forty-four thousand, nine hundred seventy-two".