1231940736 has 96 divisors (see below), whose sum is σ = 3817779420. Its totient is φ = 379054080.

The previous prime is 1231940729. The next prime is 1231940741. The reversal of 1231940736 is 6370491321.

It can be written as a sum of positive squares in 2 ways, for example, as 1011240000 + 220700736 = 31800^2 + 14856^2 .

It is a tau number, because it is divible by the number of its divisors (96).

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 1231940736.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26155 + ... + 56106.

Almost surely, 2^1231940736 is an apocalyptic number.

1231940736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1231940736 is an abundant number, since it is smaller than the sum of its proper divisors (2585838684).

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

1231940736 is a wasteful number, since it uses less digits than its factorization.

1231940736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82294 (or 82279 counting only the distinct ones).

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

The square root of 1231940736 is about 35099.0133194653. The cubic root of 1231940736 is about 1072.0044924442.

The spelling of 1231940736 in words is "one billion, two hundred thirty-one million, nine hundred forty thousand, seven hundred thirty-six".