42400023 has 8 divisors (see below), whose sum is σ = 59858928. Its totient is φ = 26603904.

The previous prime is 42400009. The next prime is 42400067. The reversal of 42400023 is 32000424.

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 42400023 - 2¹⁷ = 42268951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42399975 and 42400011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42402023) 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, 415636 + ... + 415737.

It is an arithmetic number, because the mean of its divisors is an integer number (7482366).

Almost surely, 2^42400023 is an apocalyptic number.

42400023 is a deficient number, since it is larger than the sum of its proper divisors (17458905).

42400023 is a wasteful number, since it uses less digits than its factorization.

42400023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831393.

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

The square root of 42400023 is about 6511.5300045381. The cubic root of 42400023 is about 348.7027433046.

Adding to 42400023 its reverse (32000424), we get a palindrome (74400447).

It can be divided in two parts, 42 and 400023, that added together give a triangular number (400065 = T₈₉₄).

The spelling of 42400023 in words is "forty-two million, four hundred thousand, twenty-three".