18012917 has 4 divisors (see below), whose sum is σ = 19398540. Its totient is φ = 16627296.

The previous prime is 18012901. The next prime is 18012919. The reversal of 18012917 is 71921081.

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 1739761 + 16273156 = 1319^2 + 4034^2 .

It is a cyclic number.

It is not a de Polignac number, because 18012917 - 2⁴ = 18012901 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 18012917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012919) 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, 692792 + ... + 692817.

It is an arithmetic number, because the mean of its divisors is an integer number (4849635).

Almost surely, 2^18012917 is an apocalyptic number.

It is an amenable number.

18012917 is a deficient number, since it is larger than the sum of its proper divisors (1385623).

18012917 is a wasteful number, since it uses less digits than its factorization.

18012917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385622.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 18012917 is about 4244.1626971642. The cubic root of 18012917 is about 262.1368135362.

Adding to 18012917 its reverse (71921081), we get a palindrome (89933998).

The spelling of 18012917 in words is "eighteen million, twelve thousand, nine hundred seventeen".