391093 has 4 divisors (see below), whose sum is σ = 394668. Its totient is φ = 387520.

The previous prime is 391073. The next prime is 391103. The reversal of 391093 is 390193.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33489 + 357604 = 183^2 + 598^2 .

It is a cyclic number.

It is not a de Polignac number, because 391093 - 2⁹ = 390581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1618 + ... + 1843.

It is an arithmetic number, because the mean of its divisors is an integer number (98667).

2³⁹¹⁰⁹³ is an apocalyptic number.

It is an amenable number.

391093 is a deficient number, since it is larger than the sum of its proper divisors (3575).

391093 is a wasteful number, since it uses less digits than its factorization.

391093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574.

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 391093 is about 625.3742879268. The cubic root of 391093 is about 73.1296251975.

Subtracting from 391093 its reverse (390193), we obtain a square (900 = 30²).

The spelling of 391093 in words is "three hundred ninety-one thousand, ninety-three".