42389231 has 2 divisors, whose sum is σ = 42389232. Its totient is φ = 42389230.

The previous prime is 42389219. The next prime is 42389233. The reversal of 42389231 is 13298324.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42389231 is a prime.

It is a super-2 number, since 2×42389231² = 3593693809542722, which contains 22 as substring.

Together with 42389233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42389233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21194615 + 21194616.

It is an arithmetic number, because the mean of its divisors is an integer number (21194616).

Almost surely, 2^42389231 is an apocalyptic number.

42389231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42389231 is an equidigital number, since it uses as much as digits as its factorization.

42389231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 42389231 is about 6510.7012679127. The cubic root of 42389231 is about 348.6731559045.

The spelling of 42389231 in words is "forty-two million, three hundred eighty-nine thousand, two hundred thirty-one".