42307631 has 4 divisors (see below), whose sum is σ = 42324912. Its totient is φ = 42290352.

The previous prime is 42307609. The next prime is 42307691. The reversal of 42307631 is 13670324.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42307631 is a prime.

It is a super-2 number, since 2×42307631² = 3579871281664322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42307631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42307691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4211 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (10581228).

Almost surely, 2^42307631 is an apocalyptic number.

42307631 is a deficient number, since it is larger than the sum of its proper divisors (17281).

42307631 is a wasteful number, since it uses less digits than its factorization.

42307631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17280.

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

The square root of 42307631 is about 6504.4316431184. The cubic root of 42307631 is about 348.4492782428.

Adding to 42307631 its reverse (13670324), we get a palindrome (55977955).

The spelling of 42307631 in words is "forty-two million, three hundred seven thousand, six hundred thirty-one".