12423574442 has 4 divisors (see below), whose sum is σ = 18635361666. Its totient is φ = 6211787220.

The previous prime is 12423574409. The next prime is 12423574447. The reversal of 12423574442 is 24447532421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24447532421 = 13 ⋅1880579417.

It can be written as a sum of positive squares in only one way, i.e., 6270897721 + 6152676721 = 79189^2 + 78439^2 .

It is a super-2 number, since 2×12423574442² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12423574396 and 12423574405.

It is not an unprimeable number, because it can be changed into a prime (12423574447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3105893609 + ... + 3105893612.

Almost surely, 2^12423574442 is an apocalyptic number.

12423574442 is a deficient number, since it is larger than the sum of its proper divisors (6211787224).

12423574442 is an equidigital number, since it uses as much as digits as its factorization.

12423574442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6211787223.

The product of its digits is 215040, while the sum is 38.

The spelling of 12423574442 in words is "twelve billion, four hundred twenty-three million, five hundred seventy-four thousand, four hundred forty-two".