18418408 has 8 divisors (see below), whose sum is σ = 34534530. Its totient is φ = 9209200.

The previous prime is 18418403. The next prime is 18418409. The reversal of 18418408 is 80481481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11009124 + 7409284 = 3318^2 + 2722^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18418403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1151143 + ... + 1151158.

Almost surely, 2^18418408 is an apocalyptic number.

It is an amenable number.

18418408 is a deficient number, since it is larger than the sum of its proper divisors (16116122).

18418408 is a wasteful number, since it uses less digits than its factorization.

18418408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302307 (or 2302303 counting only the distinct ones).

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

The square root of 18418408 is about 4291.6672750809. The cubic root of 18418408 is about 264.0892336857.

Adding to 18418408 its reverse (80481481), we get a palindrome (98899889).

The spelling of 18418408 in words is "eighteen million, four hundred eighteen thousand, four hundred eight".