389444431 has 2 divisors, whose sum is σ = 389444432. Its totient is φ = 389444430.

The previous prime is 389444399. The next prime is 389444437. The reversal of 389444431 is 134444983.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 389444431 - 2⁵ = 389444399 is a prime.

It is a super-2 number, since 2×389444431² = 303333929673827522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389444437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194722215 + 194722216.

It is an arithmetic number, because the mean of its divisors is an integer number (194722216).

Almost surely, 2^389444431 is an apocalyptic number.

389444431 is a deficient number, since it is larger than the sum of its proper divisors (1).

389444431 is an equidigital number, since it uses as much as digits as its factorization.

389444431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 40.

The square root of 389444431 is about 19734.3464801853. The cubic root of 389444431 is about 730.2672637452.

The spelling of 389444431 in words is "three hundred eighty-nine million, four hundred forty-four thousand, four hundred thirty-one".