18797799 has 4 divisors (see below), whose sum is σ = 25063736. Its totient is φ = 12531864.

The previous prime is 18797797. The next prime is 18797827. The reversal of 18797799 is 99779781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99779781 = 3 ⋅33259927.

It is not a de Polignac number, because 18797799 - 2¹ = 18797797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18797797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3132964 + ... + 3132969.

It is an arithmetic number, because the mean of its divisors is an integer number (6265934).

Almost surely, 2^18797799 is an apocalyptic number.

18797799 is a deficient number, since it is larger than the sum of its proper divisors (6265937).

18797799 is an equidigital number, since it uses as much as digits as its factorization.

18797799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265936.

The product of its digits is 2000376, while the sum is 57.

The square root of 18797799 is about 4335.6428589080. The cubic root of 18797799 is about 265.8902019190.

The spelling of 18797799 in words is "eighteen million, seven hundred ninety-seven thousand, seven hundred ninety-nine".