129712894 has 4 divisors (see below), whose sum is σ = 194569344. Its totient is φ = 64856446.

The previous prime is 129712837. The next prime is 129712909. The reversal of 129712894 is 498217921.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 129712894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32428222 + ... + 32428225.

It is an arithmetic number, because the mean of its divisors is an integer number (48642336).

Almost surely, 2^129712894 is an apocalyptic number.

129712894 is a deficient number, since it is larger than the sum of its proper divisors (64856450).

129712894 is an equidigital number, since it uses as much as digits as its factorization.

129712894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64856449.

The product of its digits is 72576, while the sum is 43.

The square root of 129712894 is about 11389.1568608041. The cubic root of 129712894 is about 506.2064986449.

The spelling of 129712894 in words is "one hundred twenty-nine million, seven hundred twelve thousand, eight hundred ninety-four".