16818394 has 8 divisors (see below), whose sum is σ = 25412148. Its totient is φ = 8347680.

The previous prime is 16818391. The next prime is 16818413. The reversal of 16818394 is 49381861.

It can be written as a sum of positive squares in 2 ways, for example, as 15705369 + 1113025 = 3963^2 + 1055^2 .

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

It is not an unprimeable number, because it can be changed into a prime (16818391) 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, 30417 + ... + 30964.

Almost surely, 2^16818394 is an apocalyptic number.

16818394 is a deficient number, since it is larger than the sum of its proper divisors (8593754).

16818394 is a wasteful number, since it uses less digits than its factorization.

16818394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61520.

The product of its digits is 41472, while the sum is 40.

The square root of 16818394 is about 4101.0235307786. The cubic root of 16818394 is about 256.2092710203.

The spelling of 16818394 in words is "sixteen million, eight hundred eighteen thousand, three hundred ninety-four".