18372147 has 16 divisors (see below), whose sum is σ = 25747200. Its totient is φ = 11630432.

The previous prime is 18372103. The next prime is 18372157. The reversal of 18372147 is 74127381.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18372147 - 2⁶ = 18372083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18372157) 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 15 ways as a sum of consecutive naturals, for example, 9388 + ... + 11174.

It is an arithmetic number, because the mean of its divisors is an integer number (1609200).

Almost surely, 2^18372147 is an apocalyptic number.

18372147 is a deficient number, since it is larger than the sum of its proper divisors (7375053).

18372147 is a wasteful number, since it uses less digits than its factorization.

18372147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its digits is 9408, while the sum is 33.

The square root of 18372147 is about 4286.2742562743. The cubic root of 18372147 is about 263.8679464689.

The spelling of 18372147 in words is "eighteen million, three hundred seventy-two thousand, one hundred forty-seven".