18681446 has 48 divisors (see below), whose sum is σ = 35020800. Its totient is φ = 7429968.

The previous prime is 18681431. The next prime is 18681463. The reversal of 18681446 is 64418681.

18681446 = 206² + 207² + ... + 401².

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147035 + ... + 147161.

It is an arithmetic number, because the mean of its divisors is an integer number (729600).

Almost surely, 2^18681446 is an apocalyptic number.

18681446 is a deficient number, since it is larger than the sum of its proper divisors (16339354).

18681446 is a wasteful number, since it uses less digits than its factorization.

18681446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 234 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 18681446 is about 4322.2038360077. The cubic root of 18681446 is about 265.3404713589.

The spelling of 18681446 in words is "eighteen million, six hundred eighty-one thousand, four hundred forty-six".