18023897 has 4 divisors (see below), whose sum is σ = 18161616. Its totient is φ = 17886180.

The previous prime is 18023849. The next prime is 18023909. The reversal of 18023897 is 79832081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18023897 - 2⁶ = 18023833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18023897.

It is not an unprimeable number, because it can be changed into a prime (18023197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68663 + ... + 68924.

It is an arithmetic number, because the mean of its divisors is an integer number (4540404).

Almost surely, 2^18023897 is an apocalyptic number.

It is an amenable number.

18023897 is a deficient number, since it is larger than the sum of its proper divisors (137719).

18023897 is a wasteful number, since it uses less digits than its factorization.

18023897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137718.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 18023897 is about 4245.4560414636. The cubic root of 18023897 is about 262.1900656475.

The spelling of 18023897 in words is "eighteen million, twenty-three thousand, eight hundred ninety-seven".