12440019778 has 8 divisors (see below), whose sum is σ = 18660552768. Its totient is φ = 6219835524.

The previous prime is 12440019749. The next prime is 12440019799. The reversal of 12440019778 is 87791004421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37875 + ... + 162217.

It is an arithmetic number, because the mean of its divisors is an integer number (2332569096).

Almost surely, 2^12440019778 is an apocalyptic number.

12440019778 is a deficient number, since it is larger than the sum of its proper divisors (6220532990).

12440019778 is a wasteful number, since it uses less digits than its factorization.

12440019778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174368.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 12440019778 in words is "twelve billion, four hundred forty million, nineteen thousand, seven hundred seventy-eight".