11399639978 has 8 divisors (see below), whose sum is σ = 17105148000. Its totient is φ = 5697923980.

The previous prime is 11399639971. The next prime is 11399639981. The reversal of 11399639978 is 87993699311.

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

It is not an unprimeable number, because it can be changed into a prime (11399639971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 940478 + ... + 952521.

It is an arithmetic number, because the mean of its divisors is an integer number (2138143500).

Almost surely, 2^11399639978 is an apocalyptic number.

11399639978 is a deficient number, since it is larger than the sum of its proper divisors (5705508022).

11399639978 is a wasteful number, since it uses less digits than its factorization.

11399639978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896012.

The product of its digits is 19840464, while the sum is 65.

The spelling of 11399639978 in words is "eleven billion, three hundred ninety-nine million, six hundred thirty-nine thousand, nine hundred seventy-eight".