12409999940 has 24 divisors (see below), whose sum is σ = 28065692760. Its totient is φ = 4582153728.

The previous prime is 12409999939. The next prime is 12409999951. The reversal of 12409999940 is 4999990421.

It can be written as a sum of positive squares in 4 ways, for example, as 2267092996 + 10142906944 = 47614^2 + 100712^2 .

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23865125 + ... + 23865644.

It is an arithmetic number, because the mean of its divisors is an integer number (1169403865).

Almost surely, 2^12409999940 is an apocalyptic number.

12409999940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12409999940 is an abundant number, since it is smaller than the sum of its proper divisors (15655692820).

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

12409999940 is a wasteful number, since it uses less digits than its factorization.

12409999940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47730791 (or 47730789 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 56.

The spelling of 12409999940 in words is "twelve billion, four hundred nine million, nine hundred ninety-nine thousand, nine hundred forty".