391338 has 16 divisors (see below), whose sum is σ = 869760. Its totient is φ = 130428.

The previous prime is 391337. The next prime is 391351. The reversal of 391338 is 833193.

391338 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (391331) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3570 + ... + 3677.

It is an arithmetic number, because the mean of its divisors is an integer number (54360).

2³⁹¹³³⁸ is an apocalyptic number.

391338 is an abundant number, since it is smaller than the sum of its proper divisors (478422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391338 is a wasteful number, since it uses less digits than its factorization.

391338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7258 (or 7252 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 391338 is about 625.5701399523. The cubic root of 391338 is about 73.1448926813.

It can be divided in two parts, 391 and 338, that added together give a 6-th power (729 = 3⁶).

The spelling of 391338 in words is "three hundred ninety-one thousand, three hundred thirty-eight".