18224018 has 8 divisors (see below), whose sum is σ = 27374412. Its totient is φ = 9099216.

The previous prime is 18223999. The next prime is 18224023. The reversal of 18224018 is 81042281.

It can be written as a sum of positive squares in 2 ways, for example, as 16752649 + 1471369 = 4093^2 + 1213^2 .

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

It is a super-2 number, since 2×18224018² = 664229664128648, 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, 4505 + ... + 7532.

Almost surely, 2^18224018 is an apocalyptic number.

18224018 is a deficient number, since it is larger than the sum of its proper divisors (9150394).

18224018 is a wasteful number, since it uses less digits than its factorization.

18224018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12796.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 18224018 is about 4268.9598264683. The cubic root of 18224018 is about 263.1568697939.

Adding to 18224018 its reverse (81042281), we get a palindrome (99266299).

The spelling of 18224018 in words is "eighteen million, two hundred twenty-four thousand, eighteen".