12423400442 has 4 divisors (see below), whose sum is σ = 18635100666. Its totient is φ = 6211700220.

The previous prime is 12423400433. The next prime is 12423400469. The reversal of 12423400442 is 24400432421.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 8139828841 + 4283571601 = 90221^2 + 65449^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3105850109 + ... + 3105850112.

Almost surely, 2^12423400442 is an apocalyptic number.

12423400442 is a deficient number, since it is larger than the sum of its proper divisors (6211700224).

12423400442 is an equidigital number, since it uses as much as digits as its factorization.

12423400442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6211700223.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 12423400442 its reverse (24400432421), we get a palindrome (36823832863).

The spelling of 12423400442 in words is "twelve billion, four hundred twenty-three million, four hundred thousand, four hundred forty-two".