129399874 has 4 divisors (see below), whose sum is σ = 194099814. Its totient is φ = 64699936.

The previous prime is 129399839. The next prime is 129399877. The reversal of 129399874 is 478993921.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 82682649 + 46717225 = 9093^2 + 6835^2 .

It is not an unprimeable number, because it can be changed into a prime (129399877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32349967 + ... + 32349970.

Almost surely, 2^129399874 is an apocalyptic number.

129399874 is a deficient number, since it is larger than the sum of its proper divisors (64699940).

129399874 is an equidigital number, since it uses as much as digits as its factorization.

129399874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64699939.

The product of its digits is 979776, while the sum is 52.

The square root of 129399874 is about 11375.4065421856. The cubic root of 129399874 is about 505.7989822637.

The spelling of 129399874 in words is "one hundred twenty-nine million, three hundred ninety-nine thousand, eight hundred seventy-four".