129023998 has 16 divisors (see below), whose sum is σ = 196390656. Its totient is φ = 63564760.

The previous prime is 129023989. The next prime is 129024029. The reversal of 129023998 is 899320921.

It is a congruent number.

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, 80715 + ... + 82297.

It is an arithmetic number, because the mean of its divisors is an integer number (12274416).

Almost surely, 2^129023998 is an apocalyptic number.

129023998 is a deficient number, since it is larger than the sum of its proper divisors (67366658).

129023998 is a wasteful number, since it uses less digits than its factorization.

129023998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 129023998 is about 11358.8730955144. The cubic root of 129023998 is about 505.3087652016.

It can be divided in two parts, 12902 and 3998, that added together give a square (16900 = 130²).

The spelling of 129023998 in words is "one hundred twenty-nine million, twenty-three thousand, nine hundred ninety-eight".