129409388 has 6 divisors (see below), whose sum is σ = 226466436. Its totient is φ = 64704692.

The previous prime is 129409373. The next prime is 129409393. The reversal of 129409388 is 883904921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16176170 + ... + 16176177.

It is an arithmetic number, because the mean of its divisors is an integer number (37744406).

Almost surely, 2^129409388 is an apocalyptic number.

It is an amenable number.

129409388 is a deficient number, since it is larger than the sum of its proper divisors (97057048).

129409388 is a wasteful number, since it uses less digits than its factorization.

129409388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32352351 (or 32352349 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 129409388 is about 11375.8247173557. The cubic root of 129409388 is about 505.8113780861.

The spelling of 129409388 in words is "one hundred twenty-nine million, four hundred nine thousand, three hundred eighty-eight".