1308891 has 8 divisors (see below), whose sum is σ = 1837120. Its totient is φ = 826632.

The previous prime is 1308887. The next prime is 1308899. The reversal of 1308891 is 1988031.

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

It is not a de Polignac number, because 1308891 - 2² = 1308887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1308899) 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, 11425 + ... + 11538.

It is an arithmetic number, because the mean of its divisors is an integer number (229640).

2^1308891 is an apocalyptic number.

1308891 is a deficient number, since it is larger than the sum of its proper divisors (528229).

1308891 is a wasteful number, since it uses less digits than its factorization.

1308891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22985.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1308891 is about 1144.0677427495. The cubic root of 1308891 is about 109.3875328224.

The spelling of 1308891 in words is "one million, three hundred eight thousand, eight hundred ninety-one".