18145917 has 16 divisors (see below), whose sum is σ = 26981760. Its totient is φ = 12052800.

The previous prime is 18145913. The next prime is 18145921. The reversal of 18145917 is 71954181.

It is an interprime number because it is at equal distance from previous prime (18145913) and next prime (18145921).

It is not a de Polignac number, because 18145917 - 2² = 18145913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18145913) 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 15 ways as a sum of consecutive naturals, for example, 7317 + ... + 9477.

It is an arithmetic number, because the mean of its divisors is an integer number (1686360).

Almost surely, 2^18145917 is an apocalyptic number.

It is an amenable number.

18145917 is a deficient number, since it is larger than the sum of its proper divisors (8835843).

18145917 is a wasteful number, since it uses less digits than its factorization.

18145917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481 (or 2475 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 18145917 is about 4259.8024602087. The cubic root of 18145917 is about 262.7804024084.

It can be divided in two parts, 181459 and 17, that multiplied together give a palindrome (3084803).

The spelling of 18145917 in words is "eighteen million, one hundred forty-five thousand, nine hundred seventeen".