391082 has 4 divisors (see below), whose sum is σ = 586626. Its totient is φ = 195540.

The previous prime is 391073. The next prime is 391103. The reversal of 391082 is 280193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 280193 = 19 ⋅14747.

It can be written as a sum of positive squares in only one way, i.e., 383161 + 7921 = 619^2 + 89^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97769 + ... + 97772.

2³⁹¹⁰⁸² is an apocalyptic number.

391082 is a deficient number, since it is larger than the sum of its proper divisors (195544).

391082 is a wasteful number, since it uses less digits than its factorization.

391082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195543.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 391082 is about 625.3654931318. The cubic root of 391082 is about 73.1289395691.

Subtracting from 391082 its reverse (280193), we obtain a square (110889 = 333²).

The spelling of 391082 in words is "three hundred ninety-one thousand, eighty-two".