391398 has 16 divisors (see below), whose sum is σ = 894720. Its totient is φ = 111816.

The previous prime is 391397. The next prime is 391399. The reversal of 391398 is 893193.

It is an interprime number because it is at equal distance from previous prime (391397) and next prime (391399).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391398.

It is not an unprimeable number, because it can be changed into a prime (391393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4618 + ... + 4701.

It is an arithmetic number, because the mean of its divisors is an integer number (55920).

2³⁹¹³⁹⁸ is an apocalyptic number.

391398 is an abundant number, since it is smaller than the sum of its proper divisors (503322).

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

391398 is a wasteful number, since it uses less digits than its factorization.

391398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331.

The product of its digits is 5832, while the sum is 33.

The square root of 391398 is about 625.6180943675. The cubic root of 391398 is about 73.1486306856.

The spelling of 391398 in words is "three hundred ninety-one thousand, three hundred ninety-eight".