18669894 has 16 divisors (see below), whose sum is σ = 39305280. Its totient is φ = 5895720.

The previous prime is 18669853. The next prime is 18669899. The reversal of 18669894 is 49896681.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18669899) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 81772 + ... + 81999.

It is an arithmetic number, because the mean of its divisors is an integer number (2456580).

Almost surely, 2^18669894 is an apocalyptic number.

18669894 is an abundant number, since it is smaller than the sum of its proper divisors (20635386).

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

18669894 is a wasteful number, since it uses less digits than its factorization.

18669894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163795.

The product of its digits is 746496, while the sum is 51.

The square root of 18669894 is about 4320.8672740551. The cubic root of 18669894 is about 265.2857674359.

The spelling of 18669894 in words is "eighteen million, six hundred sixty-nine thousand, eight hundred ninety-four".