12387631905 has 48 divisors (see below), whose sum is σ = 23434017984. Its totient is φ = 6003527040.

The previous prime is 12387631901. The next prime is 12387631969. The reversal of 12387631905 is 50913678321.

12387631905 is a `hidden beast` number, since 1 + 2 + 3 + 8 + 7 + 631 + 9 + 0 + 5 = 666.

It is not a de Polignac number, because 12387631905 - 2² = 12387631901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12387631901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1653027 + ... + 1660503.

It is an arithmetic number, because the mean of its divisors is an integer number (488208708).

Almost surely, 2^12387631905 is an apocalyptic number.

12387631905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12387631905 is a deficient number, since it is larger than the sum of its proper divisors (11046386079).

12387631905 is a wasteful number, since it uses less digits than its factorization.

12387631905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10846 (or 10843 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 12387631905 in words is "twelve billion, three hundred eighty-seven million, six hundred thirty-one thousand, nine hundred five".