1216749204 has 72 divisors (see below), whose sum is σ = 3363534720. Its totient is φ = 367804800.

The previous prime is 1216749187. The next prime is 1216749257. The reversal of 1216749204 is 4029476121.

It is a happy number.

1216749204 is a `hidden beast` number, since 1 + 2 + 167 + 492 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167112 + ... + 174240.

It is an arithmetic number, because the mean of its divisors is an integer number (46715760).

Almost surely, 2^1216749204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216749204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1681767360).

1216749204 is an abundant number, since it is smaller than the sum of its proper divisors (2146785516).

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

1216749204 is a wasteful number, since it uses less digits than its factorization.

1216749204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7581 (or 7576 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1216749204 is about 34881.9323432633. The cubic root of 1216749204 is about 1067.5798225097.

The spelling of 1216749204 in words is "one billion, two hundred sixteen million, seven hundred forty-nine thousand, two hundred four".