42001423 has 4 divisors (see below), whose sum is σ = 42021720. Its totient is φ = 41981128.

The previous prime is 42001397. The next prime is 42001447. The reversal of 42001423 is 32410024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42001423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42001397 and 42001406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42004423) 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, 6640 + ... + 11317.

It is an arithmetic number, because the mean of its divisors is an integer number (10505430).

Almost surely, 2^42001423 is an apocalyptic number.

42001423 is a deficient number, since it is larger than the sum of its proper divisors (20297).

42001423 is a wasteful number, since it uses less digits than its factorization.

42001423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20296.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42001423 is about 6480.8504843115. The cubic root of 42001423 is about 347.6065901474.

Adding to 42001423 its reverse (32410024), we get a palindrome (74411447).

It can be divided in two parts, 42001 and 423, that added together give a palindrome (42424).

The spelling of 42001423 in words is "forty-two million, one thousand, four hundred twenty-three".