18396974 has 4 divisors (see below), whose sum is σ = 27595464. Its totient is φ = 9198486.

The previous prime is 18396947. The next prime is 18396979. The reversal of 18396974 is 47969381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47969381 = 43 ⋅1115567.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18396979) 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 as a sum of consecutive naturals, namely, 4599242 + ... + 4599245.

It is an arithmetic number, because the mean of its divisors is an integer number (6898866).

Almost surely, 2^18396974 is an apocalyptic number.

18396974 is a deficient number, since it is larger than the sum of its proper divisors (9198490).

18396974 is an equidigital number, since it uses as much as digits as its factorization.

18396974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9198489.

The product of its digits is 326592, while the sum is 47.

The square root of 18396974 is about 4289.1693834588. The cubic root of 18396974 is about 263.9867513247.

The spelling of 18396974 in words is "eighteen million, three hundred ninety-six thousand, nine hundred seventy-four".