129987344 has 10 divisors (see below), whose sum is σ = 251850510. Its totient is φ = 64993664.

The previous prime is 129987331. The next prime is 129987353. The reversal of 129987344 is 443789921.

It can be written as a sum of positive squares in only one way, i.e., 116208400 + 13778944 = 10780^2 + 3712^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4062089 + ... + 4062120.

It is an arithmetic number, because the mean of its divisors is an integer number (25185051).

Almost surely, 2^129987344 is an apocalyptic number.

It is an amenable number.

129987344 is a deficient number, since it is larger than the sum of its proper divisors (121863166).

129987344 is an equidigital number, since it uses as much as digits as its factorization.

129987344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8124217 (or 8124211 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 129987344 is about 11401.1992351682. The cubic root of 129987344 is about 506.5632622158.

The spelling of 129987344 in words is "one hundred twenty-nine million, nine hundred eighty-seven thousand, three hundred forty-four".