11938218399 has 32 divisors (see below), whose sum is σ = 17976857600. Its totient is φ = 7829071200.

The previous prime is 11938218371. The next prime is 11938218469. The reversal of 11938218399 is 99381283911.

11938218399 is a `hidden beast` number, since 1 + 1 + 9 + 38 + 218 + 399 = 666.

It is not a de Polignac number, because 11938218399 - 2⁵ = 11938218367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11938218349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 405717 + ... + 434145.

It is an arithmetic number, because the mean of its divisors is an integer number (561776800).

Almost surely, 2^11938218399 is an apocalyptic number.

11938218399 is a deficient number, since it is larger than the sum of its proper divisors (6038639201).

11938218399 is a wasteful number, since it uses less digits than its factorization.

11938218399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28692 (or 28686 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The spelling of 11938218399 in words is "eleven billion, nine hundred thirty-eight million, two hundred eighteen thousand, three hundred ninety-nine".