129157890 has 32 divisors (see below), whose sum is σ = 313908480. Its totient is φ = 34005504.

The previous prime is 129157883. The next prime is 129157921. The reversal of 129157890 is 98751921.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24879 + ... + 29618.

It is an arithmetic number, because the mean of its divisors is an integer number (9809640).

Almost surely, 2^129157890 is an apocalyptic number.

129157890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129157890 is an abundant number, since it is smaller than the sum of its proper divisors (184750590).

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

129157890 is a wasteful number, since it uses less digits than its factorization.

129157890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54586.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 129157890 is about 11364.7652857417. The cubic root of 129157890 is about 505.4834960335.

The spelling of 129157890 in words is "one hundred twenty-nine million, one hundred fifty-seven thousand, eight hundred ninety".