129998736 has 80 divisors (see below), whose sum is σ = 426460800. Its totient is φ = 37141632.

The previous prime is 129998731. The next prime is 129998753. The reversal of 129998736 is 637899921.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (129998731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18471 + ... + 24518.

It is an arithmetic number, because the mean of its divisors is an integer number (5330760).

Almost surely, 2^129998736 is an apocalyptic number.

129998736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129998736 is an abundant number, since it is smaller than the sum of its proper divisors (296462064).

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

129998736 is a wasteful number, since it uses less digits than its factorization.

129998736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43013 (or 43001 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 129998736 is about 11401.6988207898. The cubic root of 129998736 is about 506.5780600670.

The spelling of 129998736 in words is "one hundred twenty-nine million, nine hundred ninety-eight thousand, seven hundred thirty-six".