1216158900 has 108 divisors (see below), whose sum is σ = 3867835776. Its totient is φ = 294817600.

The previous prime is 1216158899. The next prime is 1216158901. The reversal of 1216158900 is 98516121.

It is an interprime number because it is at equal distance from previous prime (1216158899) and next prime (1216158901).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216158901) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19549 + ... + 53051.

Almost surely, 2^1216158900 is an apocalyptic number.

1216158900 is a gapful number since it is divisible by the number (10) 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 1216158900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1933917888).

1216158900 is an abundant number, since it is smaller than the sum of its proper divisors (2651676876).

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

1216158900 is a wasteful number, since it uses less digits than its factorization.

1216158900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33542 (or 33524 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 1216158900 is about 34873.4698589056. The cubic root of 1216158900 is about 1067.4071496811.

The spelling of 1216158900 in words is "one billion, two hundred sixteen million, one hundred fifty-eight thousand, nine hundred".