18145387 has 8 divisors (see below), whose sum is σ = 20215440. Its totient is φ = 16171680.

The previous prime is 18145363. The next prime is 18145423. The reversal of 18145387 is 78354181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18145387 - 2²³ = 9756779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18145327) 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 7 ways as a sum of consecutive naturals, for example, 23689 + ... + 24442.

It is an arithmetic number, because the mean of its divisors is an integer number (2526930).

Almost surely, 2^18145387 is an apocalyptic number.

18145387 is a deficient number, since it is larger than the sum of its proper divisors (2070053).

18145387 is a wasteful number, since it uses less digits than its factorization.

18145387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48173.

The product of its digits is 26880, while the sum is 37.

The square root of 18145387 is about 4259.7402502970. The cubic root of 18145387 is about 262.7778439822. Note that the first 3 decimals are identical.

The spelling of 18145387 in words is "eighteen million, one hundred forty-five thousand, three hundred eighty-seven".