18840097 has 4 divisors (see below), whose sum is σ = 19948356. Its totient is φ = 17731840.

The previous prime is 18840083. The next prime is 18840113. The reversal of 18840097 is 79004881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13476241 + 5363856 = 3671^2 + 2316^2 .

It is a cyclic number.

It is not a de Polignac number, because 18840097 - 2⁷ = 18839969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18840037) 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 3 ways as a sum of consecutive naturals, for example, 554104 + ... + 554137.

It is an arithmetic number, because the mean of its divisors is an integer number (4987089).

Almost surely, 2^18840097 is an apocalyptic number.

18840097 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18840097 is a deficient number, since it is larger than the sum of its proper divisors (1108259).

18840097 is a wasteful number, since it uses less digits than its factorization.

18840097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108258.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18840097 is about 4340.5180566379. The cubic root of 18840097 is about 266.0894840926.

The spelling of 18840097 in words is "eighteen million, eight hundred forty thousand, ninety-seven".