129731449392 has 100 divisors (see below), whose sum is σ = 381636102496. Its totient is φ = 42534875520.

The previous prime is 129731449391. The next prime is 129731449403. The reversal of 129731449392 is 293944137921.

129731449392 is a `hidden beast` number, since 1 + 297 + 314 + 4 + 9 + 39 + 2 = 666.

It is a super-2 number, since 2×129731449392² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (129731449391) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 741448 + ... + 899559.

Almost surely, 2^129731449392 is an apocalyptic number.

129731449392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129731449392 is an abundant number, since it is smaller than the sum of its proper divisors (251904653104).

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

129731449392 is a wasteful number, since it uses less digits than its factorization.

129731449392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641088 (or 1641073 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The spelling of 129731449392 in words is "one hundred twenty-nine billion, seven hundred thirty-one million, four hundred forty-nine thousand, three hundred ninety-two".