18874897 has 2 divisors, whose sum is σ = 18874898. Its totient is φ = 18874896.

The previous prime is 18874859. The next prime is 18874957. The reversal of 18874897 is 79847881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10342656 + 8532241 = 3216^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 18874897 - 2⁷ = 18874769 is a prime.

It is not a weakly prime, because it can be changed into another prime (18874997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9437448 + 9437449.

It is an arithmetic number, because the mean of its divisors is an integer number (9437449).

Almost surely, 2^18874897 is an apocalyptic number.

It is an amenable number.

18874897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18874897 is an equidigital number, since it uses as much as digits as its factorization.

18874897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 52.

The square root of 18874897 is about 4344.5249452616. The cubic root of 18874897 is about 266.2532167685.

The spelling of 18874897 in words is "eighteen million, eight hundred seventy-four thousand, eight hundred ninety-seven".