18943386 has 64 divisors (see below), whose sum is σ = 47748096. Its totient is φ = 4867200.

The previous prime is 18943381. The next prime is 18943417. The reversal of 18943386 is 68334981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (18943381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60366 + ... + 60678.

It is an arithmetic number, because the mean of its divisors is an integer number (746064).

Almost surely, 2^18943386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18943386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23874048).

18943386 is an abundant number, since it is smaller than the sum of its proper divisors (28804710).

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

18943386 is a wasteful number, since it uses less digits than its factorization.

18943386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its digits is 124416, while the sum is 42.

The square root of 18943386 is about 4352.4000275710. The cubic root of 18943386 is about 266.5748680552.

The spelling of 18943386 in words is "eighteen million, nine hundred forty-three thousand, three hundred eighty-six".