1309195872 has 60 divisors (see below), whose sum is σ = 3850316316. Its totient is φ = 436397760.

The previous prime is 1309195871. The next prime is 1309195933. The reversal of 1309195872 is 2785919031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309195871) 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 9 ways as a sum of consecutive naturals, for example, 249954 + ... + 255137.

Almost surely, 2^1309195872 is an apocalyptic number.

1309195872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1309195872 is an abundant number, since it is smaller than the sum of its proper divisors (2541120444).

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

1309195872 is an equidigital number, since it uses as much as digits as its factorization.

1309195872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505113 (or 505096 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1309195872 is about 36182.8118310338. The cubic root of 1309195872 is about 1093.9602515340.

The spelling of 1309195872 in words is "one billion, three hundred nine million, one hundred ninety-five thousand, eight hundred seventy-two".