442400023 has 4 divisors (see below), whose sum is σ = 476430808. Its totient is φ = 408369240.

The previous prime is 442400011. The next prime is 442400041. The reversal of 442400023 is 320004244.

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 442400023 - 2¹⁷ = 442268951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442400323) 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, 17015373 + ... + 17015398.

It is an arithmetic number, because the mean of its divisors is an integer number (119107702).

Almost surely, 2^442400023 is an apocalyptic number.

442400023 is a deficient number, since it is larger than the sum of its proper divisors (34030785).

442400023 is a wasteful number, since it uses less digits than its factorization.

442400023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34030784.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 442400023 is about 21033.3074669677. The cubic root of 442400023 is about 761.9708904038.

Adding to 442400023 its reverse (320004244), we get a palindrome (762404267).

The spelling of 442400023 in words is "four hundred forty-two million, four hundred thousand, twenty-three".