129017994 has 32 divisors (see below), whose sum is σ = 307722240. Its totient is φ = 35259312.

The previous prime is 129017963. The next prime is 129018007. The reversal of 129017994 is 499710921.

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

It is a Curzon number.

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, 65814 + ... + 67745.

It is an arithmetic number, because the mean of its divisors is an integer number (9616320).

Almost surely, 2^129017994 is an apocalyptic number.

129017994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

129017994 is an abundant number, since it is smaller than the sum of its proper divisors (178704246).

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

129017994 is a wasteful number, since it uses less digits than its factorization.

129017994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133594.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 129017994 is about 11358.6088056593. The cubic root of 129017994 is about 505.3009270709.

The spelling of 129017994 in words is "one hundred twenty-nine million, seventeen thousand, nine hundred ninety-four".