18746281 has 2 divisors, whose sum is σ = 18746282. Its totient is φ = 18746280.

The previous prime is 18746269. The next prime is 18746333. The reversal of 18746281 is 18264781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9865881 + 8880400 = 3141^2 + 2980^2 .

It is an emirp because it is prime and its reverse (18264781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18746281 - 2⁵ = 18746249 is a prime.

It is a super-2 number, since 2×18746281² = 702846102661922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18746281.

It is not a weakly prime, because it can be changed into another prime (18743281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9373140 + 9373141.

It is an arithmetic number, because the mean of its divisors is an integer number (9373141).

Almost surely, 2^18746281 is an apocalyptic number.

It is an amenable number.

18746281 is a deficient number, since it is larger than the sum of its proper divisors (1).

18746281 is an equidigital number, since it uses as much as digits as its factorization.

18746281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 37.

The square root of 18746281 is about 4329.6975644957. The cubic root of 18746281 is about 265.6470765688.

The spelling of 18746281 in words is "eighteen million, seven hundred forty-six thousand, two hundred eighty-one".