129427870 has 64 divisors (see below), whose sum is σ = 283227840. Its totient is φ = 41932800.

The previous prime is 129427861. The next prime is 129427871. The reversal of 129427870 is 78724921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129427871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39910 + ... + 43030.

It is an arithmetic number, because the mean of its divisors is an integer number (4425435).

Almost surely, 2^129427870 is an apocalyptic number.

129427870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129427870 is an abundant number, since it is smaller than the sum of its proper divisors (153799970).

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

129427870 is a wasteful number, since it uses less digits than its factorization.

129427870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3181.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 129427870 is about 11376.6370250615. The cubic root of 129427870 is about 505.8354566094.

The spelling of 129427870 in words is "one hundred twenty-nine million, four hundred twenty-seven thousand, eight hundred seventy".