129251890 has 16 divisors (see below), whose sum is σ = 236597760. Its totient is φ = 50824240.

The previous prime is 129251887. The next prime is 129251921. The reversal of 129251890 is 98152921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108946 + ... + 110125.

It is an arithmetic number, because the mean of its divisors is an integer number (14787360).

Almost surely, 2^129251890 is an apocalyptic number.

129251890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129251890 is a deficient number, since it is larger than the sum of its proper divisors (107345870).

129251890 is a wasteful number, since it uses less digits than its factorization.

129251890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219137.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 129251890 is about 11368.9001227032. The cubic root of 129251890 is about 505.6060951411.

The spelling of 129251890 in words is "one hundred twenty-nine million, two hundred fifty-one thousand, eight hundred ninety".