42634391 has 2 divisors, whose sum is σ = 42634392. Its totient is φ = 42634390.

The previous prime is 42634381. The next prime is 42634439. The reversal of 42634391 is 19343624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42634391 - 2⁶ = 42634327 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 (42634381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21317195 + 21317196.

It is an arithmetic number, because the mean of its divisors is an integer number (21317196).

Almost surely, 2^42634391 is an apocalyptic number.

42634391 is a deficient number, since it is larger than the sum of its proper divisors (1).

42634391 is an equidigital number, since it uses as much as digits as its factorization.

42634391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 42634391 is about 6529.5015889423. The cubic root of 42634391 is about 349.3440530681.

The spelling of 42634391 in words is "forty-two million, six hundred thirty-four thousand, three hundred ninety-one".