389743391 has 2 divisors, whose sum is σ = 389743392. Its totient is φ = 389743390.

The previous prime is 389743373. The next prime is 389743399. The reversal of 389743391 is 193347983.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (193347983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389743391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389743399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194871695 + 194871696.

It is an arithmetic number, because the mean of its divisors is an integer number (194871696).

Almost surely, 2^389743391 is an apocalyptic number.

389743391 is a deficient number, since it is larger than the sum of its proper divisors (1).

389743391 is an equidigital number, since it uses as much as digits as its factorization.

389743391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 389743391 is about 19741.9196381710. The cubic root of 389743391 is about 730.4540810353.

The spelling of 389743391 in words is "three hundred eighty-nine million, seven hundred forty-three thousand, three hundred ninety-one".