42423031 has 4 divisors (see below), whose sum is σ = 48483472. Its totient is φ = 36362592.

The previous prime is 42423011. The next prime is 42423049. The reversal of 42423031 is 13032424.

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

It is not a de Polignac number, because 42423031 - 2⁷ = 42422903 is a prime.

It is a super-2 number, since 2×42423031² = 3599427118453922, 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 (42423011) 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, 3030210 + ... + 3030223.

It is an arithmetic number, because the mean of its divisors is an integer number (12120868).

Almost surely, 2^42423031 is an apocalyptic number.

42423031 is a deficient number, since it is larger than the sum of its proper divisors (6060441).

42423031 is an equidigital number, since it uses as much as digits as its factorization.

42423031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060440.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 42423031 is about 6513.2964772072. The cubic root of 42423031 is about 348.7658053927.

Adding to 42423031 its reverse (13032424), we get a palindrome (55455455).

The spelling of 42423031 in words is "forty-two million, four hundred twenty-three thousand, thirty-one".