18858144 has 24 divisors (see below), whose sum is σ = 49502880. Its totient is φ = 6286016.

The previous prime is 18858143. The next prime is 18858157. The reversal of 18858144 is 44185881.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (18858143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98124 + ... + 98315.

It is an arithmetic number, because the mean of its divisors is an integer number (2062620).

Almost surely, 2^18858144 is an apocalyptic number.

It is an amenable number.

18858144 is an abundant number, since it is smaller than the sum of its proper divisors (30644736).

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

18858144 is a wasteful number, since it uses less digits than its factorization.

18858144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196452 (or 196444 counting only the distinct ones).

The product of its digits is 40960, while the sum is 39.

The square root of 18858144 is about 4342.5964583415. The cubic root of 18858144 is about 266.1744196853.

The spelling of 18858144 in words is "eighteen million, eight hundred fifty-eight thousand, one hundred forty-four".