1308391 has 8 divisors (see below), whose sum is σ = 1502240. Its totient is φ = 1116288.

The previous prime is 1308383. The next prime is 1308403. The reversal of 1308391 is 1938031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1308391 - 2³ = 1308383 is a prime.

It is a Duffinian number.

1308391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1308301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2635 + ... + 3091.

It is an arithmetic number, because the mean of its divisors is an integer number (187780).

2^1308391 is an apocalyptic number.

1308391 is a deficient number, since it is larger than the sum of its proper divisors (193849).

1308391 is an equidigital number, since it uses as much as digits as its factorization.

1308391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1308391 is about 1143.8492033481. The cubic root of 1308391 is about 109.3736022679.

The spelling of 1308391 in words is "one million, three hundred eight thousand, three hundred ninety-one".