18142549 has 4 divisors (see below), whose sum is σ = 19097440. Its totient is φ = 17187660.

The previous prime is 18142513. The next prime is 18142567. The reversal of 18142549 is 94524181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18142549 - 2¹¹ = 18140501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18146549) 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, 477417 + ... + 477454.

It is an arithmetic number, because the mean of its divisors is an integer number (4774360).

Almost surely, 2^18142549 is an apocalyptic number.

18142549 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18142549 is a deficient number, since it is larger than the sum of its proper divisors (954891).

18142549 is an equidigital number, since it uses as much as digits as its factorization.

18142549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954890.

The product of its digits is 11520, while the sum is 34.

The square root of 18142549 is about 4259.4071183675. The cubic root of 18142549 is about 262.7641434862.

The spelling of 18142549 in words is "eighteen million, one hundred forty-two thousand, five hundred forty-nine".