391673 has 6 divisors (see below), whose sum is σ = 403182. Its totient is φ = 380480.

The previous prime is 391661. The next prime is 391679. The reversal of 391673 is 376193.

It can be written as a sum of positive squares in 3 ways, for example, as 41209 + 350464 = 203^2 + 592^2 .

It is not a de Polignac number, because 391673 - 2¹² = 387577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391679) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1565 + ... + 1797.

It is an arithmetic number, because the mean of its divisors is an integer number (67197).

2³⁹¹⁶⁷³ is an apocalyptic number.

It is an amenable number.

391673 is a deficient number, since it is larger than the sum of its proper divisors (11509).

391673 is an equidigital number, since it uses as much as digits as its factorization.

391673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 274 counting only the distinct ones).

The product of its digits is 3402, while the sum is 29.

The square root of 391673 is about 625.8378384214. The cubic root of 391673 is about 73.1657583187.

The spelling of 391673 in words is "three hundred ninety-one thousand, six hundred seventy-three".