42843391 has 2 divisors, whose sum is σ = 42843392. Its totient is φ = 42843390.

The previous prime is 42843343. The next prime is 42843397. The reversal of 42843391 is 19334824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42843391 - 2²¹ = 40746239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42843397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21421695 + 21421696.

It is an arithmetic number, because the mean of its divisors is an integer number (21421696).

Almost surely, 2^42843391 is an apocalyptic number.

42843391 is a deficient number, since it is larger than the sum of its proper divisors (1).

42843391 is an equidigital number, since it uses as much as digits as its factorization.

42843391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 42843391 is about 6545.4863073724. The cubic root of 42843391 is about 349.9139679702.

It can be divided in two parts, 42843 and 391, that added together give a palindrome (43234).

The spelling of 42843391 in words is "forty-two million, eight hundred forty-three thousand, three hundred ninety-one".