18987865870 has 8 divisors (see below), whose sum is σ = 34178158584. Its totient is φ = 7595146344.

The previous prime is 18987865849. The next prime is 18987865873. The reversal of 18987865870 is 7856878981.

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

It is a super-2 number, since 2×18987865870² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18987865796 and 18987865805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987865873) 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, 949393284 + ... + 949393303.

It is an arithmetic number, because the mean of its divisors is an integer number (4272269823).

Almost surely, 2^18987865870 is an apocalyptic number.

18987865870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18987865870 is a deficient number, since it is larger than the sum of its proper divisors (15190292714).

18987865870 is a wasteful number, since it uses less digits than its factorization.

18987865870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898786594.

The product of its (nonzero) digits is 54190080, while the sum is 67.

The spelling of 18987865870 in words is "eighteen billion, nine hundred eighty-seven million, eight hundred sixty-five thousand, eight hundred seventy".