18857497 has 2 divisors, whose sum is σ = 18857498. Its totient is φ = 18857496.

The previous prime is 18857491. The next prime is 18857507. The reversal of 18857497 is 79475881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14409616 + 4447881 = 3796^2 + 2109^2 .

It is an emirp because it is prime and its reverse (79475881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18857497 - 2¹⁹ = 18333209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18857497.

It is not a weakly prime, because it can be changed into another prime (18857491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428748 + 9428749.

It is an arithmetic number, because the mean of its divisors is an integer number (9428749).

Almost surely, 2^18857497 is an apocalyptic number.

It is an amenable number.

18857497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18857497 is an equidigital number, since it uses as much as digits as its factorization.

18857497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 49.

The square root of 18857497 is about 4342.5219630993. The cubic root of 18857497 is about 266.1713756102.

The spelling of 18857497 in words is "eighteen million, eight hundred fifty-seven thousand, four hundred ninety-seven".