18404818 has 8 divisors (see below), whose sum is σ = 28280700. Its totient is φ = 8977920.

The previous prime is 18404797. The next prime is 18404839. The reversal of 18404818 is 81840481.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18404797) and next prime (18404839).

It can be written as a sum of positive squares in 2 ways, for example, as 17867529 + 537289 = 4227^2 + 733^2 .

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

It is a super-2 number, since 2×18404818² = 677474651226248, which contains 22 as substring.

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, 112143 + ... + 112306.

Almost surely, 2^18404818 is an apocalyptic number.

18404818 is a deficient number, since it is larger than the sum of its proper divisors (9875882).

18404818 is a wasteful number, since it uses less digits than its factorization.

18404818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224492.

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 18404818 is about 4290.0836821675. The cubic root of 18404818 is about 264.0242650638.

The spelling of 18404818 in words is "eighteen million, four hundred four thousand, eight hundred eighteen".