129172390 has 8 divisors (see below), whose sum is σ = 232510320. Its totient is φ = 51668952.

The previous prime is 129172363. The next prime is 129172423. The reversal of 129172390 is 93271921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6458610 + ... + 6458629.

It is an arithmetic number, because the mean of its divisors is an integer number (29063790).

Almost surely, 2^129172390 is an apocalyptic number.

129172390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129172390 is a deficient number, since it is larger than the sum of its proper divisors (103337930).

129172390 is a wasteful number, since it uses less digits than its factorization.

129172390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12917246.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 129172390 is about 11365.4032044622. The cubic root of 129172390 is about 505.5024114773.

The spelling of 129172390 in words is "one hundred twenty-nine million, one hundred seventy-two thousand, three hundred ninety".