18974797 has 2 divisors, whose sum is σ = 18974798. Its totient is φ = 18974796.

The previous prime is 18974783. The next prime is 18974807. The reversal of 18974797 is 79747981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16883881 + 2090916 = 4109^2 + 1446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18974797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18974717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9487398 + 9487399.

It is an arithmetic number, because the mean of its divisors is an integer number (9487399).

Almost surely, 2^18974797 is an apocalyptic number.

It is an amenable number.

18974797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18974797 is an equidigital number, since it uses as much as digits as its factorization.

18974797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 52.

The square root of 18974797 is about 4356.0070018309. The cubic root of 18974797 is about 266.7221271800.

It can be divided in two parts, 1897 and 4797, that multiplied together give a palindrome (9099909).

The spelling of 18974797 in words is "eighteen million, nine hundred seventy-four thousand, seven hundred ninety-seven".