18421448 has 8 divisors (see below), whose sum is σ = 34540230. Its totient is φ = 9210720.

The previous prime is 18421439. The next prime is 18421483. The reversal of 18421448 is 84412481.

It can be written as a sum of positive squares in only one way, i.e., 11142244 + 7279204 = 3338^2 + 2698^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1151333 + ... + 1151348.

Almost surely, 2^18421448 is an apocalyptic number.

It is an amenable number.

18421448 is a deficient number, since it is larger than the sum of its proper divisors (16118782).

18421448 is a wasteful number, since it uses less digits than its factorization.

18421448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302687 (or 2302683 counting only the distinct ones).

The product of its digits is 8192, while the sum is 32.

The square root of 18421448 is about 4292.0214351748. The cubic root of 18421448 is about 264.1037623953.

The spelling of 18421448 in words is "eighteen million, four hundred twenty-one thousand, four hundred forty-eight".