129433988 has 12 divisors (see below), whose sum is σ = 239833692. Its totient is φ = 60910080.

The previous prime is 129433973. The next prime is 129433991. The reversal of 129433988 is 889334921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39715204 + 89718784 = 6302^2 + 9472^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951653 + ... + 951788.

It is an arithmetic number, because the mean of its divisors is an integer number (19986141).

Almost surely, 2^129433988 is an apocalyptic number.

It is an amenable number.

129433988 is a deficient number, since it is larger than the sum of its proper divisors (110399704).

129433988 is a wasteful number, since it uses less digits than its factorization.

129433988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903462 (or 1903460 counting only the distinct ones).

The product of its digits is 373248, while the sum is 47.

The square root of 129433988 is about 11376.9059062647. The cubic root of 129433988 is about 505.8434266923.

The spelling of 129433988 in words is "one hundred twenty-nine million, four hundred thirty-three thousand, nine hundred eighty-eight".