1304391 has 24 divisors (see below), whose sum is σ = 2006784. Its totient is φ = 747040.

The previous prime is 1304389. The next prime is 1304411. The reversal of 1304391 is 1934031.

It is not a de Polignac number, because 1304391 - 2¹ = 1304389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27730 + ... + 27776.

It is an arithmetic number, because the mean of its divisors is an integer number (83616).

2^1304391 is an apocalyptic number.

1304391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1304391 is a deficient number, since it is larger than the sum of its proper divisors (702393).

1304391 is a wasteful number, since it uses less digits than its factorization.

1304391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1304391 is about 1142.0993827159. The cubic root of 1304391 is about 109.2620298601.

The spelling of 1304391 in words is "one million, three hundred four thousand, three hundred ninety-one".