129927840 has 96 divisors (see below), whose sum is σ = 467752320. Its totient is φ = 29697024.

The previous prime is 129927823. The next prime is 129927869. The reversal of 129927840 is 48729921.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 129927792 and 129927801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15975 + ... + 22694.

It is an arithmetic number, because the mean of its divisors is an integer number (4872420).

Almost surely, 2^129927840 is an apocalyptic number.

129927840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129927840 is an abundant number, since it is smaller than the sum of its proper divisors (337824480).

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

129927840 is a wasteful number, since it uses less digits than its factorization.

129927840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38694 (or 38686 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 129927840 is about 11398.5893864109. The cubic root of 129927840 is about 506.4859543282.

The spelling of 129927840 in words is "one hundred twenty-nine million, nine hundred twenty-seven thousand, eight hundred forty".