18289397 has 12 divisors (see below), whose sum is σ = 21450240. Its totient is φ = 15547896.

The previous prime is 18289391. The next prime is 18289429. The reversal of 18289397 is 79398281.

It is not a de Polignac number, because 18289397 - 2¹² = 18285301 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18289391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4754 + ... + 7692.

It is an arithmetic number, because the mean of its divisors is an integer number (1787520).

Almost surely, 2^18289397 is an apocalyptic number.

It is an amenable number.

18289397 is a deficient number, since it is larger than the sum of its proper divisors (3160843).

18289397 is a wasteful number, since it uses less digits than its factorization.

18289397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080 (or 3073 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The square root of 18289397 is about 4276.6104568922. The cubic root of 18289397 is about 263.4711875907.

The spelling of 18289397 in words is "eighteen million, two hundred eighty-nine thousand, three hundred ninety-seven".