129820404 has 36 divisors (see below), whose sum is σ = 352371264. Its totient is φ = 37091376.

The previous prime is 129820403. The next prime is 129820409. The reversal of 129820404 is 404028921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129820403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109804 + ... + 110979.

Almost surely, 2^129820404 is an apocalyptic number.

129820404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129820404 is an abundant number, since it is smaller than the sum of its proper divisors (222550860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129820404 is a wasteful number, since it uses less digits than its factorization.

129820404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220804 (or 220795 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 129820404 is about 11393.8757233875. The cubic root of 129820404 is about 506.3463131493.

The spelling of 129820404 in words is "one hundred twenty-nine million, eight hundred twenty thousand, four hundred four".