1299720132 has 36 divisors (see below), whose sum is σ = 3288574380. Its totient is φ = 432821952.

The previous prime is 1299720101. The next prime is 1299720151. The reversal of 1299720132 is 2310279921.

It can be written as a sum of positive squares in 2 ways, for example, as 691900416 + 607819716 = 26304^2 + 24654^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21598 + ... + 55370.

Almost surely, 2^1299720132 is an apocalyptic number.

1299720132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1299720132 is an abundant number, since it is smaller than the sum of its proper divisors (1988854248).

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

1299720132 is a wasteful number, since it uses less digits than its factorization.

1299720132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34852 (or 34847 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1299720132 is about 36051.6314748723. The cubic root of 1299720132 is about 1091.3145579675.

The spelling of 1299720132 in words is "one billion, two hundred ninety-nine million, seven hundred twenty thousand, one hundred thirty-two".