18799997 has 2 divisors, whose sum is σ = 18799998. Its totient is φ = 18799996.

The previous prime is 18799967. The next prime is 18800003. The reversal of 18799997 is 79999781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18757561 + 42436 = 4331^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 18799997 - 2⁶ = 18799933 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 (18799967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9399998 + 9399999.

It is an arithmetic number, because the mean of its divisors is an integer number (9399999).

Almost surely, 2^18799997 is an apocalyptic number.

It is an amenable number.

18799997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18799997 is an equidigital number, since it uses as much as digits as its factorization.

18799997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 59.

The square root of 18799997 is about 4335.8963317865. The cubic root of 18799997 is about 265.9005649033.

The spelling of 18799997 in words is "eighteen million, seven hundred ninety-nine thousand, nine hundred ninety-seven".