11838969478 has 16 divisors (see below), whose sum is σ = 20709568800. Its totient is φ = 5073843768.

The previous prime is 11838969437. The next prime is 11838969517. The reversal of 11838969478 is 87496983811.

11838969478 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11838969478² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8628301 + ... + 8629672.

It is an arithmetic number, because the mean of its divisors is an integer number (1294348050).

Almost surely, 2^11838969478 is an apocalyptic number.

11838969478 is a deficient number, since it is larger than the sum of its proper divisors (8870599322).

11838969478 is an equidigital number, since it uses as much as digits as its factorization.

11838969478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17257996 (or 17257982 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 64.

The spelling of 11838969478 in words is "eleven billion, eight hundred thirty-eight million, nine hundred sixty-nine thousand, four hundred seventy-eight".