1309387136 has 32 divisors (see below), whose sum is σ = 2616024600. Its totient is φ = 652816384.

The previous prime is 1309387133. The next prime is 1309387153. The reversal of 1309387136 is 6317839031.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 1309387093 and 1309387102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309387133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30695 + ... + 59673.

Almost surely, 2^1309387136 is an apocalyptic number.

1309387136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1309387136 is a deficient number, since it is larger than the sum of its proper divisors (1306637464).

1309387136 is an equidigital number, since it uses as much as digits as its factorization.

1309387136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29346 (or 29334 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1309387136 is about 36185.4547574022. The cubic root of 1309387136 is about 1094.0135221534.

The spelling of 1309387136 in words is "one billion, three hundred nine million, three hundred eighty-seven thousand, one hundred thirty-six".