42423691 has 4 divisors (see below), whose sum is σ = 43224192. Its totient is φ = 41623192.

The previous prime is 42423683. The next prime is 42423697. The reversal of 42423691 is 19632424.

It is a happy number.

42423691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42423691 - 2³ = 42423683 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42423697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400171 + ... + 400276.

It is an arithmetic number, because the mean of its divisors is an integer number (10806048).

Almost surely, 2^42423691 is an apocalyptic number.

42423691 is a deficient number, since it is larger than the sum of its proper divisors (800501).

42423691 is an equidigital number, since it uses as much as digits as its factorization.

42423691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800500.

The product of its digits is 10368, while the sum is 31.

The square root of 42423691 is about 6513.3471425988. The cubic root of 42423691 is about 348.7676140348.

The spelling of 42423691 in words is "forty-two million, four hundred twenty-three thousand, six hundred ninety-one".