1368391 has 4 divisors (see below), whose sum is σ = 1370800. Its totient is φ = 1365984.

The previous prime is 1368377. The next prime is 1368397. The reversal of 1368391 is 1938631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1938631 = 83 ⋅23357.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1368391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1368397) 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, 175 + ... + 1663.

It is an arithmetic number, because the mean of its divisors is an integer number (342700).

2^1368391 is an apocalyptic number.

1368391 is a deficient number, since it is larger than the sum of its proper divisors (2409).

1368391 is an equidigital number, since it uses as much as digits as its factorization.

1368391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408.

The product of its digits is 3888, while the sum is 31.

The square root of 1368391 is about 1169.7824584084. The cubic root of 1368391 is about 111.0205572942.

The spelling of 1368391 in words is "one million, three hundred sixty-eight thousand, three hundred ninety-one".