42000400023 has 16 divisors (see below), whose sum is σ = 56883778560. Its totient is φ = 27561466944.

The previous prime is 42000399953. The next prime is 42000400037. The reversal of 42000400023 is 32000400024.

It is a happy number.

It is not a de Polignac number, because 42000400023 - 2¹⁷ = 42000268951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42000399975 and 42000400011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42000400063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293161 + ... + 412242.

It is an arithmetic number, because the mean of its divisors is an integer number (3555236160).

Almost surely, 2^42000400023 is an apocalyptic number.

42000400023 is a deficient number, since it is larger than the sum of its proper divisors (14883378537).

42000400023 is a wasteful number, since it uses less digits than its factorization.

42000400023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705718.

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

Adding to 42000400023 its reverse (32000400024), we get a palindrome (74000800047).

Subtracting from 42000400023 its reverse (32000400024), we obtain a palindrome (9999999999).

The spelling of 42000400023 in words is "forty-two billion, four hundred thousand, twenty-three".