42320231 has 4 divisors (see below), whose sum is σ = 42708600. Its totient is φ = 41931864.

The previous prime is 42320203. The next prime is 42320237. The reversal of 42320231 is 13202324.

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

It is a de Polignac number, because none of the positive numbers 2^k-42320231 is a prime.

It is a super-2 number, since 2×42320231² = 3582003903786722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42320237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194021 + ... + 194238.

It is an arithmetic number, because the mean of its divisors is an integer number (10677150).

Almost surely, 2^42320231 is an apocalyptic number.

42320231 is a deficient number, since it is larger than the sum of its proper divisors (388369).

42320231 is a wasteful number, since it uses less digits than its factorization.

42320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388368.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 42320231 is about 6505.4001414210. The cubic root of 42320231 is about 348.4838663696.

Adding to 42320231 its reverse (13202324), we get a palindrome (55522555).

The spelling of 42320231 in words is "forty-two million, three hundred twenty thousand, two hundred thirty-one".