129423897540 has 144 divisors (see below), whose sum is σ = 468176986368. Its totient is φ = 28296398592.

The previous prime is 129423897481. The next prime is 129423897553. The reversal of 129423897540 is 45798324921.

129423897540 is a `hidden beast` number, since 1 + 2 + 9 + 4 + 2 + 3 + 8 + 97 + 540 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2204007 + ... + 2261966.

It is an arithmetic number, because the mean of its divisors is an integer number (3251229072).

Almost surely, 2^129423897540 is an apocalyptic number.

129423897540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129423897540 is an abundant number, since it is smaller than the sum of its proper divisors (338753088828).

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

129423897540 is a wasteful number, since it uses less digits than its factorization.

129423897540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4466018 (or 4466013 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 129423897540 in words is "one hundred twenty-nine billion, four hundred twenty-three million, eight hundred ninety-seven thousand, five hundred forty".