18147955 has 32 divisors (see below), whose sum is σ = 25850880. Its totient is φ = 11975040.

The previous prime is 18147947. The next prime is 18147967. The reversal of 18147955 is 55974181.

It is a happy number.

It is not a de Polignac number, because 18147955 - 2³ = 18147947 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 166441 + ... + 166549.

It is an arithmetic number, because the mean of its divisors is an integer number (807840).

Almost surely, 2^18147955 is an apocalyptic number.

18147955 is a deficient number, since it is larger than the sum of its proper divisors (7702925).

18147955 is a wasteful number, since it uses less digits than its factorization.

18147955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259.

The product of its digits is 50400, while the sum is 40.

The square root of 18147955 is about 4260.0416664629. The cubic root of 18147955 is about 262.7902398172.

The spelling of 18147955 in words is "eighteen million, one hundred forty-seven thousand, nine hundred fifty-five".