18005397 has 8 divisors (see below), whose sum is σ = 25419456. Its totient is φ = 11297472.

The previous prime is 18005381. The next prime is 18005399. The reversal of 18005397 is 79350081.

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

It is not a de Polignac number, because 18005397 - 2⁴ = 18005381 is a prime.

It is a super-2 number, since 2×18005397² = 648388642255218, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18005399) 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 7 ways as a sum of consecutive naturals, for example, 176473 + ... + 176574.

It is an arithmetic number, because the mean of its divisors is an integer number (3177432).

Almost surely, 2^18005397 is an apocalyptic number.

18005397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18005397 is a deficient number, since it is larger than the sum of its proper divisors (7414059).

18005397 is a wasteful number, since it uses less digits than its factorization.

18005397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353067.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 18005397 is about 4243.2766819994. The cubic root of 18005397 is about 262.1003296578.

The spelling of 18005397 in words is "eighteen million, five thousand, three hundred ninety-seven".