18990448 has 20 divisors (see below), whose sum is σ = 37419480. Its totient is φ = 9333824.

The previous prime is 18990427. The next prime is 18990451. The reversal of 18990448 is 84409981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9115 + ... + 11002.

It is an arithmetic number, because the mean of its divisors is an integer number (1870974).

Almost surely, 2^18990448 is an apocalyptic number.

It is an amenable number.

18990448 is a deficient number, since it is larger than the sum of its proper divisors (18429032).

18990448 is a wasteful number, since it uses less digits than its factorization.

18990448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20184 (or 20178 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18990448 is about 4357.8031162502. The cubic root of 18990448 is about 266.7954405826.

The spelling of 18990448 in words is "eighteen million, nine hundred ninety thousand, four hundred forty-eight".