129909744 has 60 divisors (see below), whose sum is σ = 377043576. Its totient is φ = 43301952.

The previous prime is 129909743. The next prime is 129909749. The reversal of 129909744 is 447909921.

It is a happy number.

It is a super-2 number, since 2×129909744² = 33753083172291072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129909744.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129909743) 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, 12819 + ... + 20594.

Almost surely, 2^129909744 is an apocalyptic number.

It is an amenable number.

129909744 is an abundant number, since it is smaller than the sum of its proper divisors (247133832).

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

129909744 is an equidigital number, since it uses as much as digits as its factorization.

129909744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33436 (or 33418 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 129909744 is about 11397.7955763384. The cubic root of 129909744 is about 506.4624392361.

The spelling of 129909744 in words is "one hundred twenty-nine million, nine hundred nine thousand, seven hundred forty-four".