391339 has 4 divisors (see below), whose sum is σ = 421456. Its totient is φ = 361224.

The previous prime is 391337. The next prime is 391351. The reversal of 391339 is 933193.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 933193 = 31 ⋅30103.

It is a cyclic number.

It is not a de Polignac number, because 391339 - 2¹ = 391337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391331) 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, 15039 + ... + 15064.

It is an arithmetic number, because the mean of its divisors is an integer number (105364).

2³⁹¹³³⁹ is an apocalyptic number.

391339 is a deficient number, since it is larger than the sum of its proper divisors (30117).

391339 is a wasteful number, since it uses less digits than its factorization.

391339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30116.

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

The square root of 391339 is about 625.5709392227. The cubic root of 391339 is about 73.1449549845.

It can be divided in two parts, 39 and 1339, that added together give a triangular number (1378 = T₅₂).

The spelling of 391339 in words is "three hundred ninety-one thousand, three hundred thirty-nine".