814391 has 4 divisors (see below), whose sum is σ = 821712. Its totient is φ = 807072.

The previous prime is 814381. The next prime is 814393. The reversal of 814391 is 193418.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 814391 - 2⁶ = 814327 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12 and base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 814391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (814393) 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, 3491 + ... + 3716.

It is an arithmetic number, because the mean of its divisors is an integer number (205428).

2⁸¹⁴³⁹¹ is an apocalyptic number.

814391 is a deficient number, since it is larger than the sum of its proper divisors (7321).

814391 is a wasteful number, since it uses less digits than its factorization.

814391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7320.

The product of its digits is 864, while the sum is 26.

The square root of 814391 is about 902.4361473257. The cubic root of 814391 is about 93.3851144073.

The spelling of 814391 in words is "eight hundred fourteen thousand, three hundred ninety-one".