11981630438 has 8 divisors (see below), whose sum is σ = 18277063560. Its totient is φ = 5889275920.

The previous prime is 11981630389. The next prime is 11981630483. The reversal of 11981630438 is 83403618911.

11981630438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50769503 + ... + 50769738.

It is an arithmetic number, because the mean of its divisors is an integer number (2284632945).

Almost surely, 2^11981630438 is an apocalyptic number.

11981630438 is a deficient number, since it is larger than the sum of its proper divisors (6295433122).

11981630438 is a wasteful number, since it uses less digits than its factorization.

11981630438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101539302.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 11981630438 in words is "eleven billion, nine hundred eighty-one million, six hundred thirty thousand, four hundred thirty-eight".