18885870 has 48 divisors (see below), whose sum is σ = 49375872. Its totient is φ = 5008320.

The previous prime is 18885857. The next prime is 18885883. The reversal of 18885870 is 7858881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18885857) and next prime (18885883).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 19600 + ... + 20540.

It is an arithmetic number, because the mean of its divisors is an integer number (1028664).

Almost surely, 2^18885870 is an apocalyptic number.

18885870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18885870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24687936).

18885870 is an abundant number, since it is smaller than the sum of its proper divisors (30490002).

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

18885870 is a wasteful number, since it uses less digits than its factorization.

18885870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The square root of 18885870 is about 4345.7876156112. The cubic root of 18885870 is about 266.3048025788.

The spelling of 18885870 in words is "eighteen million, eight hundred eighty-five thousand, eight hundred seventy".