391345 has 16 divisors (see below), whose sum is σ = 508032. Its totient is φ = 288640.

The previous prime is 391337. The next prime is 391351. The reversal of 391345 is 543193.

It is not a de Polignac number, because 391345 - 2³ = 391337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4674 + ... + 4756.

It is an arithmetic number, because the mean of its divisors is an integer number (31752).

2³⁹¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

391345 is a deficient number, since it is larger than the sum of its proper divisors (116687).

391345 is a wasteful number, since it uses less digits than its factorization.

391345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152.

The product of its digits is 1620, while the sum is 25.

The square root of 391345 is about 625.5757348235. The cubic root of 391345 is about 73.1453288015.

The spelling of 391345 in words is "three hundred ninety-one thousand, three hundred forty-five".