129622918 has 4 divisors (see below), whose sum is σ = 194434380. Its totient is φ = 64811458.

The previous prime is 129622901. The next prime is 129622919. The reversal of 129622918 is 819226921.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129622919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32405728 + ... + 32405731.

It is an arithmetic number, because the mean of its divisors is an integer number (48608595).

Almost surely, 2^129622918 is an apocalyptic number.

129622918 is a deficient number, since it is larger than the sum of its proper divisors (64811462).

129622918 is an equidigital number, since it uses as much as digits as its factorization.

129622918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64811461.

The product of its digits is 31104, while the sum is 40.

The square root of 129622918 is about 11385.2061026580. The cubic root of 129622918 is about 506.0894273455.

The spelling of 129622918 in words is "one hundred twenty-nine million, six hundred twenty-two thousand, nine hundred eighteen".