393391 has 4 divisors (see below), whose sum is σ = 395352. Its totient is φ = 391432.

The previous prime is 393383. The next prime is 393401. The reversal of 393391 is 193393.

It is a happy number.

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 393391 - 2³ = 393383 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 (393301) 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, 640 + ... + 1093.

It is an arithmetic number, because the mean of its divisors is an integer number (98838).

2³⁹³³⁹¹ is an apocalyptic number.

393391 is a deficient number, since it is larger than the sum of its proper divisors (1961).

393391 is a wasteful number, since it uses less digits than its factorization.

393391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960.

The product of its digits is 2187, while the sum is 28.

The square root of 393391 is about 627.2088966206. The cubic root of 393391 is about 73.2725782379.

It can be divided in two parts, 39339 and 1, that added together give a triangular number (39340 = T₂₈₀).

The spelling of 393391 in words is "three hundred ninety-three thousand, three hundred ninety-one".