18396247 has 4 divisors (see below), whose sum is σ = 18743400. Its totient is φ = 18049096.

The previous prime is 18396239. The next prime is 18396263. The reversal of 18396247 is 74269381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18396247 - 2³ = 18396239 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18396277) 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, 173497 + ... + 173602.

It is an arithmetic number, because the mean of its divisors is an integer number (4685850).

Almost surely, 2^18396247 is an apocalyptic number.

18396247 is a deficient number, since it is larger than the sum of its proper divisors (347153).

18396247 is an equidigital number, since it uses as much as digits as its factorization.

18396247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347152.

The product of its digits is 72576, while the sum is 40.

The square root of 18396247 is about 4289.0846342780. The cubic root of 18396247 is about 263.9832739250.

The spelling of 18396247 in words is "eighteen million, three hundred ninety-six thousand, two hundred forty-seven".