391922 has 8 divisors (see below), whose sum is σ = 592896. Its totient is φ = 194292.

The previous prime is 391921. The next prime is 391939. The reversal of 391922 is 229193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×391922³ = 180601013334928344, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 391891 and 391900.

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 391922.

It is not an unprimeable number, because it can be changed into a prime (391921) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 518 + ... + 1025.

It is an arithmetic number, because the mean of its divisors is an integer number (74112).

2³⁹¹⁹²² is an apocalyptic number.

391922 is a deficient number, since it is larger than the sum of its proper divisors (200974).

391922 is a wasteful number, since it uses less digits than its factorization.

391922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its digits is 972, while the sum is 26.

The square root of 391922 is about 626.0367401359. The cubic root of 391922 is about 73.1812596974.

The spelling of 391922 in words is "three hundred ninety-one thousand, nine hundred twenty-two".