129402398920 has 32 divisors (see below), whose sum is σ = 291165969600. Its totient is φ = 51759080128.

The previous prime is 129402398891. The next prime is 129402398927. The reversal of 129402398920 is 29893204921.

It is not an unprimeable number, because it can be changed into a prime (129402398927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1726791 + ... + 1800169.

It is an arithmetic number, because the mean of its divisors is an integer number (9098936550).

Almost surely, 2^129402398920 is an apocalyptic number.

129402398920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129402398920 is an abundant number, since it is smaller than the sum of its proper divisors (161763570680).

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

129402398920 is a wasteful number, since it uses less digits than its factorization.

129402398920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117477 (or 117473 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 129402398920 in words is "one hundred twenty-nine billion, four hundred two million, three hundred ninety-eight thousand, nine hundred twenty".