11646439938 has 48 divisors (see below), whose sum is σ = 28844936640. Its totient is φ = 3326846688.

The previous prime is 11646439913. The next prime is 11646439943. The reversal of 11646439938 is 83993464611.

11646439938 is a `hidden beast` number, since 1 + 164 + 64 + 399 + 38 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 975481 + ... + 987347.

It is an arithmetic number, because the mean of its divisors is an integer number (600936180).

Almost surely, 2^11646439938 is an apocalyptic number.

11646439938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11646439938 is an abundant number, since it is smaller than the sum of its proper divisors (17198496702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11646439938 is a wasteful number, since it uses less digits than its factorization.

11646439938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19671 (or 19668 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

It can be divided in two parts, 11646 and 439938, that added together give a square (451584 = 672²).

The spelling of 11646439938 in words is "eleven billion, six hundred forty-six million, four hundred thirty-nine thousand, nine hundred thirty-eight".