18988870 has 8 divisors (see below), whose sum is σ = 34179984. Its totient is φ = 7595544.

The previous prime is 18988867. The next prime is 18988877. The reversal of 18988870 is 7888981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 949434 + ... + 949453.

It is an arithmetic number, because the mean of its divisors is an integer number (4272498).

Almost surely, 2^18988870 is an apocalyptic number.

18988870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18988870 is a deficient number, since it is larger than the sum of its proper divisors (15191114).

18988870 is a wasteful number, since it uses less digits than its factorization.

18988870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898894.

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 18988870 is about 4357.6220579578. The cubic root of 18988870 is about 266.7880506416.

The spelling of 18988870 in words is "eighteen million, nine hundred eighty-eight thousand, eight hundred seventy".