1216354752 has 112 divisors (see below), whose sum is σ = 3596538400. Its totient is φ = 403107840.

The previous prime is 1216354751. The next prime is 1216354753. The reversal of 1216354752 is 2574536121.

1216354752 is a `hidden beast` number, since 1 + 2 + 1 + 63 + 547 + 52 = 666.

It is an interprime number because it is at equal distance from previous prime (1216354751) and next prime (1216354753).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216354751) 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, 310824 + ... + 314712.

It is an arithmetic number, because the mean of its divisors is an integer number (32111950).

Almost surely, 2^1216354752 is an apocalyptic number.

1216354752 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 1216354752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798269200).

1216354752 is an abundant number, since it is smaller than the sum of its proper divisors (2380183648).

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

1216354752 is a wasteful number, since it uses less digits than its factorization.

1216354752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091 (or 4075 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 1216354752 is about 34876.2777830433. The cubic root of 1216354752 is about 1067.4644455394.

The spelling of 1216354752 in words is "one billion, two hundred sixteen million, three hundred fifty-four thousand, seven hundred fifty-two".