18770797 has 2 divisors, whose sum is σ = 18770798. Its totient is φ = 18770796.

The previous prime is 18770789. The next prime is 18770831. The reversal of 18770797 is 79707781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17065161 + 1705636 = 4131^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 18770797 - 2³ = 18770789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18770707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9385398 + 9385399.

It is an arithmetic number, because the mean of its divisors is an integer number (9385399).

Almost surely, 2^18770797 is an apocalyptic number.

It is an amenable number.

18770797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18770797 is an equidigital number, since it uses as much as digits as its factorization.

18770797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172872, while the sum is 46.

The square root of 18770797 is about 4332.5277841002. The cubic root of 18770797 is about 265.7628287150.

The spelling of 18770797 in words is "eighteen million, seven hundred seventy thousand, seven hundred ninety-seven".