18067817 has 2 divisors, whose sum is σ = 18067818. Its totient is φ = 18067816.

The previous prime is 18067793. The next prime is 18067843. The reversal of 18067817 is 71876081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16152361 + 1915456 = 4019^2 + 1384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18067817 is a prime.

It is a super-2 number, since 2×18067817² = 652892022290978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18067417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9033908 + 9033909.

It is an arithmetic number, because the mean of its divisors is an integer number (9033909).

Almost surely, 2^18067817 is an apocalyptic number.

It is an amenable number.

18067817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18067817 is an equidigital number, since it uses as much as digits as its factorization.

18067817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 18067817 is about 4250.6254833848. The cubic root of 18067817 is about 262.4028580844.

The spelling of 18067817 in words is "eighteen million, sixty-seven thousand, eight hundred seventeen".