12343400442 has 24 divisors (see below), whose sum is σ = 27666243540. Its totient is φ = 3972588480.

The previous prime is 12343400411. The next prime is 12343400449. The reversal of 12343400442 is 24400434321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11029410441 + 1313990001 = 105021^2 + 36249^2 .

It is not an unprimeable number, because it can be changed into a prime (12343400449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11822659 + ... + 11823702.

Almost surely, 2^12343400442 is an apocalyptic number.

12343400442 is an abundant number, since it is smaller than the sum of its proper divisors (15322843098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12343400442 is a wasteful number, since it uses less digits than its factorization.

12343400442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23646398 (or 23646395 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 12343400442 its reverse (24400434321), we get a palindrome (36743834763).

The spelling of 12343400442 in words is "twelve billion, three hundred forty-three million, four hundred thousand, four hundred forty-two".