18987190187 has 8 divisors (see below), whose sum is σ = 21700889856. Its totient is φ = 16273801512.

The previous prime is 18987190177. The next prime is 18987190247. The reversal of 18987190187 is 78109178981.

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

It is a cyclic number.

It is not a de Polignac number, because 18987190187 - 2¹² = 18987186091 is a prime.

It is a super-4 number, since 4×18987190187⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18987190177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72428 + ... + 207894.

It is an arithmetic number, because the mean of its divisors is an integer number (2712611232).

Almost surely, 2^18987190187 is an apocalyptic number.

18987190187 is a deficient number, since it is larger than the sum of its proper divisors (2713699669).

18987190187 is a wasteful number, since it uses less digits than its factorization.

18987190187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155497.

The product of its (nonzero) digits is 2032128, while the sum is 59.

The spelling of 18987190187 in words is "eighteen billion, nine hundred eighty-seven million, one hundred ninety thousand, one hundred eighty-seven".