129699198 has 32 divisors (see below), whose sum is σ = 291878400. Its totient is φ = 42684408.

The previous prime is 129699197. The next prime is 129699221. The reversal of 129699198 is 891996921.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129699191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10936 + ... + 19467.

It is an arithmetic number, because the mean of its divisors is an integer number (9121200).

Almost surely, 2^129699198 is an apocalyptic number.

129699198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129699198 is an abundant number, since it is smaller than the sum of its proper divisors (162179202).

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

129699198 is a wasteful number, since it uses less digits than its factorization.

129699198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30493 (or 30487 counting only the distinct ones).

The product of its digits is 629856, while the sum is 54.

The square root of 129699198 is about 11388.5555712742. Note that the first 4 decimals coincide. The cubic root of 129699198 is about 506.1886817365.

The spelling of 129699198 in words is "one hundred twenty-nine million, six hundred ninety-nine thousand, one hundred ninety-eight".