129442590 has 64 divisors (see below), whose sum is σ = 365497920. Its totient is φ = 32486400.

The previous prime is 129442583. The next prime is 129442609. The reversal of 129442590 is 95244921.

129442590 is a `hidden beast` number, since 1 + 29 + 4 + 42 + 590 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9511 + ... + 18690.

It is an arithmetic number, because the mean of its divisors is an integer number (5710905).

Almost surely, 2^129442590 is an apocalyptic number.

129442590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129442590 is an abundant number, since it is smaller than the sum of its proper divisors (236055330).

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

129442590 is a wasteful number, since it uses less digits than its factorization.

129442590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28234 (or 28228 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 129442590 is about 11377.2839465314. The cubic root of 129442590 is about 505.8546323239.

The spelling of 129442590 in words is "one hundred twenty-nine million, four hundred forty-two thousand, five hundred ninety".