18879693840 has 200 divisors, whose sum is σ = 74939578560. Its totient is φ = 4315348224.

The previous prime is 18879693827. The next prime is 18879693841. The reversal of 18879693840 is 4839697881.

18879693840 is a `hidden beast` number, since 188 + 79 + 6 + 9 + 384 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (18879693841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 162750 + ... + 253469.

Almost surely, 2^18879693840 is an apocalyptic number.

18879693840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18879693840 is an abundant number, since it is smaller than the sum of its proper divisors (56059884720).

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

18879693840 is a wasteful number, since it uses less digits than its factorization.

18879693840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416251 (or 416236 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 18879693840 in words is "eighteen billion, eight hundred seventy-nine million, six hundred ninety-three thousand, eight hundred forty".