18259897 has 2 divisors, whose sum is σ = 18259898. Its totient is φ = 18259896.

The previous prime is 18259867. The next prime is 18259903. The reversal of 18259897 is 79895281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13697401 + 4562496 = 3701^2 + 2136^2 .

It is an emirp because it is prime and its reverse (79895281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18259897 - 2²³ = 9871289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18259897.

It is not a weakly prime, because it can be changed into another prime (18259807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9129948 + 9129949.

It is an arithmetic number, because the mean of its divisors is an integer number (9129949).

Almost surely, 2^18259897 is an apocalyptic number.

It is an amenable number.

18259897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18259897 is an equidigital number, since it uses as much as digits as its factorization.

18259897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The square root of 18259897 is about 4273.1600718906. The cubic root of 18259897 is about 263.3294555145.

The spelling of 18259897 in words is "eighteen million, two hundred fifty-nine thousand, eight hundred ninety-seven".