129198870 has 24 divisors (see below), whose sum is σ = 335917296. Its totient is φ = 34453008.

The previous prime is 129198869. The next prime is 129198871. The reversal of 129198870 is 78891921.

It is an interprime number because it is at equal distance from previous prime (129198869) and next prime (129198871).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129198871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 717682 + ... + 717861.

It is an arithmetic number, because the mean of its divisors is an integer number (13996554).

Almost surely, 2^129198870 is an apocalyptic number.

129198870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129198870 is an abundant number, since it is smaller than the sum of its proper divisors (206718426).

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

129198870 is a wasteful number, since it uses less digits than its factorization.

129198870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435556 (or 1435553 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 129198870 is about 11366.5680836390. The cubic root of 129198870 is about 505.5369513385.

The spelling of 129198870 in words is "one hundred twenty-nine million, one hundred ninety-eight thousand, eight hundred seventy".