42707831 has 2 divisors, whose sum is σ = 42707832. Its totient is φ = 42707830.

The previous prime is 42707779. The next prime is 42707837. The reversal of 42707831 is 13870724.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42707831 - 2⁶ = 42707767 is a prime.

It is a super-2 number, since 2×42707831² = 3647917657449122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42707837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21353915 + 21353916.

It is an arithmetic number, because the mean of its divisors is an integer number (21353916).

Almost surely, 2^42707831 is an apocalyptic number.

42707831 is a deficient number, since it is larger than the sum of its proper divisors (1).

42707831 is an equidigital number, since it uses as much as digits as its factorization.

42707831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 42707831 is about 6535.1228756619. The cubic root of 42707831 is about 349.5445258911.

The spelling of 42707831 in words is "forty-two million, seven hundred seven thousand, eight hundred thirty-one".