42040023 has 8 divisors (see below), whose sum is σ = 56843136. Its totient is φ = 27631800.

The previous prime is 42040007. The next prime is 42040051. The reversal of 42040023 is 32004024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42040023 - 2⁴ = 42040007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42039984 and 42040011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42040093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98473 + ... + 98898.

It is an arithmetic number, because the mean of its divisors is an integer number (7105392).

Almost surely, 2^42040023 is an apocalyptic number.

42040023 is a deficient number, since it is larger than the sum of its proper divisors (14803113).

42040023 is a wasteful number, since it uses less digits than its factorization.

42040023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197445.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 42040023 is about 6483.8278046228. The cubic root of 42040023 is about 347.7130429386.

Adding to 42040023 its reverse (32004024), we get a palindrome (74044047).

The spelling of 42040023 in words is "forty-two million, forty thousand, twenty-three".