1307891 has 12 divisors (see below), whose sum is σ = 1449360. Its totient is φ = 1179360.

The previous prime is 1307863. The next prime is 1307893. The reversal of 1307891 is 1987031.

It is a de Polignac number, because none of the positive numbers 2^k-1307891 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1307893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11945 + ... + 12053.

It is an arithmetic number, because the mean of its divisors is an integer number (120780).

2^1307891 is an apocalyptic number.

1307891 is a deficient number, since it is larger than the sum of its proper divisors (141469).

1307891 is a wasteful number, since it uses less digits than its factorization.

1307891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1307891 is about 1143.6306221853. The cubic root of 1307891 is about 109.3596681639.

The spelling of 1307891 in words is "one million, three hundred seven thousand, eight hundred ninety-one".