18368197 has 4 divisors (see below), whose sum is σ = 18626976. Its totient is φ = 18109420.

The previous prime is 18368173. The next prime is 18368221. The reversal of 18368197 is 79186381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79186381 = 439 ⋅180379.

It is an interprime number because it is at equal distance from previous prime (18368173) and next prime (18368221).

It is a cyclic number.

It is not a de Polignac number, because 18368197 - 2⁷ = 18368069 is a prime.

It is a super-2 number, since 2×18368197² = 674781322061618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18360197) 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, 129283 + ... + 129424.

It is an arithmetic number, because the mean of its divisors is an integer number (4656744).

Almost surely, 2^18368197 is an apocalyptic number.

It is an amenable number.

18368197 is a deficient number, since it is larger than the sum of its proper divisors (258779).

18368197 is an equidigital number, since it uses as much as digits as its factorization.

18368197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258778.

The product of its digits is 72576, while the sum is 43.

The square root of 18368197 is about 4285.8134583764. The cubic root of 18368197 is about 263.8490346329.

The spelling of 18368197 in words is "eighteen million, three hundred sixty-eight thousand, one hundred ninety-seven".