18269138 has 8 divisors (see below), whose sum is σ = 27427788. Its totient is φ = 9126544.

The previous prime is 18269131. The next prime is 18269161. The reversal of 18269138 is 83196281.

It can be written as a sum of positive squares in 2 ways, for example, as 18258529 + 10609 = 4273^2 + 103^2 .

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

It is a super-2 number, since 2×18269138² = 667522806526088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18269131) 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, 581 + ... + 6072.

Almost surely, 2^18269138 is an apocalyptic number.

18269138 is a deficient number, since it is larger than the sum of its proper divisors (9158650).

18269138 is a wasteful number, since it uses less digits than its factorization.

18269138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8028.

The product of its digits is 20736, while the sum is 38.

The square root of 18269138 is about 4274.2412192107. The cubic root of 18269138 is about 263.3738700971.

It can be divided in two parts, 18 and 269138, that multiplied together give a palindrome (4844484).

The spelling of 18269138 in words is "eighteen million, two hundred sixty-nine thousand, one hundred thirty-eight".