42306731 has 2 divisors, whose sum is σ = 42306732. Its totient is φ = 42306730.

The previous prime is 42306713. The next prime is 42306757. The reversal of 42306731 is 13760324.

Together with previous prime (42306713) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (42306757) can be obtained adding 42306731 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42306731 - 2²² = 38112427 is a prime.

It is a super-2 number, since 2×42306731² = 3579718975812722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42306731.

It is not a weakly prime, because it can be changed into another prime (42306701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21153365 + 21153366.

It is an arithmetic number, because the mean of its divisors is an integer number (21153366).

Almost surely, 2^42306731 is an apocalyptic number.

42306731 is a deficient number, since it is larger than the sum of its proper divisors (1).

42306731 is an equidigital number, since it uses as much as digits as its factorization.

42306731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 42306731 is about 6504.3624591500. The cubic root of 42306731 is about 348.4468073995.

The spelling of 42306731 in words is "forty-two million, three hundred six thousand, seven hundred thirty-one".