18993446 has 8 divisors (see below), whose sum is σ = 29728944. Its totient is φ = 9083800.

The previous prime is 18993427. The next prime is 18993449. The reversal of 18993446 is 64439981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18993397 and 18993406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18993449) 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, 206405 + ... + 206496.

It is an arithmetic number, because the mean of its divisors is an integer number (3716118).

Almost surely, 2^18993446 is an apocalyptic number.

18993446 is a deficient number, since it is larger than the sum of its proper divisors (10735498).

18993446 is a wasteful number, since it uses less digits than its factorization.

18993446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412926.

The product of its digits is 186624, while the sum is 44.

The square root of 18993446 is about 4358.1470833371. The cubic root of 18993446 is about 266.8094794061.

The spelling of 18993446 in words is "eighteen million, nine hundred ninety-three thousand, four hundred forty-six".