1345391 has 4 divisors (see below), whose sum is σ = 1348872. Its totient is φ = 1341912.

The previous prime is 1345361. The next prime is 1345423. The reversal of 1345391 is 1935431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1935431 = 29 ⋅66739.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1345391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1345391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345301) 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, 1076 + ... + 1961.

It is an arithmetic number, because the mean of its divisors is an integer number (337218).

2^1345391 is an apocalyptic number.

1345391 is a deficient number, since it is larger than the sum of its proper divisors (3481).

1345391 is an equidigital number, since it uses as much as digits as its factorization.

1345391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480.

The product of its digits is 1620, while the sum is 26.

The square root of 1345391 is about 1159.9099102948. The cubic root of 1345391 is about 110.3950259871.

The spelling of 1345391 in words is "one million, three hundred forty-five thousand, three hundred ninety-one".