18072797 has 2 divisors, whose sum is σ = 18072798. Its totient is φ = 18072796.

The previous prime is 18072793. The next prime is 18072809. The reversal of 18072797 is 79727081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 188356 = 4229^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 18072797 - 2² = 18072793 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 (18072793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9036398 + 9036399.

It is an arithmetic number, because the mean of its divisors is an integer number (9036399).

Almost surely, 2^18072797 is an apocalyptic number.

It is an amenable number.

18072797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18072797 is an equidigital number, since it uses as much as digits as its factorization.

18072797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 18072797 is about 4251.2112391647. The cubic root of 18072797 is about 262.4269644128.

The spelling of 18072797 in words is "eighteen million, seventy-two thousand, seven hundred ninety-seven".