129691930 has 32 divisors (see below), whose sum is σ = 237968640. Its totient is φ = 50880960.

The previous prime is 129691927. The next prime is 129691931. The reversal of 129691930 is 39196921.

It is not an unprimeable number, because it can be changed into a prime (129691931) 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, 142537 + ... + 143443.

It is an arithmetic number, because the mean of its divisors is an integer number (7436520).

Almost surely, 2^129691930 is an apocalyptic number.

129691930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129691930 is a deficient number, since it is larger than the sum of its proper divisors (108276710).

129691930 is a wasteful number, since it uses less digits than its factorization.

129691930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 129691930 is about 11388.2364745381. The cubic root of 129691930 is about 506.1792264016.

The spelling of 129691930 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, nine hundred thirty".