18770897 has 2 divisors, whose sum is σ = 18770898. Its totient is φ = 18770896.

The previous prime is 18770893. The next prime is 18770911. The reversal of 18770897 is 79807781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18671041 + 99856 = 4321^2 + 316^2 .

It is an emirp because it is prime and its reverse (79807781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18770897 - 2² = 18770893 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18770893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9385448 + 9385449.

It is an arithmetic number, because the mean of its divisors is an integer number (9385449).

Almost surely, 2^18770897 is an apocalyptic number.

It is an amenable number.

18770897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18770897 is an equidigital number, since it uses as much as digits as its factorization.

18770897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 18770897 is about 4332.5393246917. The cubic root of 18770897 is about 265.7633006579.

The spelling of 18770897 in words is "eighteen million, seven hundred seventy thousand, eight hundred ninety-seven".