391393 has 2 divisors, whose sum is σ = 391394. Its totient is φ = 391392.

The previous prime is 391387. The next prime is 391397. The reversal of 391393 is 393193.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253009 + 138384 = 503^2 + 372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391393 is a prime.

391393 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (391397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195696 + 195697.

It is an arithmetic number, because the mean of its divisors is an integer number (195697).

2³⁹¹³⁹³ is an apocalyptic number.

It is an amenable number.

391393 is a deficient number, since it is larger than the sum of its proper divisors (1).

391393 is an equidigital number, since it uses as much as digits as its factorization.

391393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 28.

The square root of 391393 is about 625.6140983066. The cubic root of 391393 is about 73.1483191998.

It can be divided in two parts, 391 and 393, that added together give a square (784 = 28²).

The spelling of 391393 in words is "three hundred ninety-one thousand, three hundred ninety-three".