18393897 has 8 divisors (see below), whose sum is σ = 24801120. Its totient is φ = 12124640.

The previous prime is 18393887. The next prime is 18393913. The reversal of 18393897 is 79839381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18393897 - 2⁶ = 18393833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18393857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34179 + ... + 34712.

It is an arithmetic number, because the mean of its divisors is an integer number (3100140).

Almost surely, 2^18393897 is an apocalyptic number.

It is an amenable number.

18393897 is a deficient number, since it is larger than the sum of its proper divisors (6407223).

18393897 is an equidigital number, since it uses as much as digits as its factorization.

18393897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68983.

The product of its digits is 326592, while the sum is 48.

The square root of 18393897 is about 4288.8106743012. The cubic root of 18393897 is about 263.9720327352.

The spelling of 18393897 in words is "eighteen million, three hundred ninety-three thousand, eight hundred ninety-seven".