18997446 has 32 divisors (see below), whose sum is σ = 41448960. Its totient is φ = 5769504.

The previous prime is 18997441. The next prime is 18997453. The reversal of 18997446 is 64479981.

It is a junction number, because it is equal to n+sod(n) for n = 18997395 and 18997404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18997441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4621 + ... + 7703.

It is an arithmetic number, because the mean of its divisors is an integer number (1295280).

Almost surely, 2^18997446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18997446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20724480).

18997446 is an abundant number, since it is smaller than the sum of its proper divisors (22451514).

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

18997446 is a wasteful number, since it uses less digits than its factorization.

18997446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3180.

The product of its digits is 435456, while the sum is 48.

The square root of 18997446 is about 4358.6059698027. The cubic root of 18997446 is about 266.8282080245.

The spelling of 18997446 in words is "eighteen million, nine hundred ninety-seven thousand, four hundred forty-six".