1309623372 has 36 divisors (see below), whose sum is σ = 3311544600. Its totient is φ = 436395072.

The previous prime is 1309623361. The next prime is 1309623379. The reversal of 1309623372 is 2733269031.

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

It is a super-2 number, since 2×1309623372² = 3430226752977300768, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1309623379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186379 + ... + 193277.

It is an arithmetic number, because the mean of its divisors is an integer number (91987350).

Almost surely, 2^1309623372 is an apocalyptic number.

1309623372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1309623372 is an abundant number, since it is smaller than the sum of its proper divisors (2001921228).

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

1309623372 is a wasteful number, since it uses less digits than its factorization.

1309623372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12182 (or 12177 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 36.

The square root of 1309623372 is about 36188.7188499400. The cubic root of 1309623372 is about 1094.0793111601.

The spelling of 1309623372 in words is "one billion, three hundred nine million, six hundred twenty-three thousand, three hundred seventy-two".