12391400736 has 480 divisors, whose sum is σ = 43368405696. Its totient is φ = 3421440000.

The previous prime is 12391400729. The next prime is 12391400761. The reversal of 12391400736 is 63700419321.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12391400736.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 37436091 + ... + 37436421.

Almost surely, 2^12391400736 is an apocalyptic number.

12391400736 is a gapful number since it is divisible by the number (16) 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 12391400736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21684202848).

12391400736 is an abundant number, since it is smaller than the sum of its proper divisors (30977004960).

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

12391400736 is a wasteful number, since it uses less digits than its factorization.

12391400736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

It can be divided in two parts, 1239 and 1400736, that added together give a triangular number (1401975 = T₁₆₇₄).

The spelling of 12391400736 in words is "twelve billion, three hundred ninety-one million, four hundred thousand, seven hundred thirty-six".