18388797 has 32 divisors (see below), whose sum is σ = 29589504. Its totient is φ = 9936000.

The previous prime is 18388793. The next prime is 18388807. The reversal of 18388797 is 79788381.

It is not a de Polignac number, because 18388797 - 2² = 18388793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18388793) 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 in 31 ways as a sum of consecutive naturals, for example, 30297 + ... + 30897.

It is an arithmetic number, because the mean of its divisors is an integer number (924672).

Almost surely, 2^18388797 is an apocalyptic number.

It is an amenable number.

18388797 is a deficient number, since it is larger than the sum of its proper divisors (11200707).

18388797 is a wasteful number, since it uses less digits than its factorization.

18388797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689.

The product of its digits is 677376, while the sum is 51.

The square root of 18388797 is about 4288.2160626536. The cubic root of 18388797 is about 263.9476336676.

The spelling of 18388797 in words is "eighteen million, three hundred eighty-eight thousand, seven hundred ninety-seven".