18812797 has 2 divisors, whose sum is σ = 18812798. Its totient is φ = 18812796.

The previous prime is 18812791. The next prime is 18812803. The reversal of 18812797 is 79721881.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (18812791) and next prime (18812803).

It can be written as a sum of positive squares in only one way, i.e., 18783556 + 29241 = 4334^2 + 171^2 .

It is an emirp because it is prime and its reverse (79721881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18812797 - 2¹¹ = 18810749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18812791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9406398 + 9406399.

It is an arithmetic number, because the mean of its divisors is an integer number (9406399).

Almost surely, 2^18812797 is an apocalyptic number.

It is an amenable number.

18812797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18812797 is an equidigital number, since it uses as much as digits as its factorization.

18812797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 43.

The square root of 18812797 is about 4337.3721306801. The cubic root of 18812797 is about 265.9608974500.

The spelling of 18812797 in words is "eighteen million, eight hundred twelve thousand, seven hundred ninety-seven".