42420023 has 4 divisors (see below), whose sum is σ = 42457968. Its totient is φ = 42382080.

The previous prime is 42420017. The next prime is 42420031. The reversal of 42420023 is 32002424.

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 42420023 - 2⁶ = 42419959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42419983 and 42420010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42420013) 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, 17243 + ... + 19548.

It is an arithmetic number, because the mean of its divisors is an integer number (10614492).

Almost surely, 2^42420023 is an apocalyptic number.

42420023 is a deficient number, since it is larger than the sum of its proper divisors (37945).

42420023 is a wasteful number, since it uses less digits than its factorization.

42420023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37944.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 42420023 is about 6513.0655608553. The cubic root of 42420023 is about 348.7575621318.

Adding to 42420023 its reverse (32002424), we get a palindrome (74422447).

The spelling of 42420023 in words is "forty-two million, four hundred twenty thousand, twenty-three".