18057949 has 8 divisors (see below), whose sum is σ = 22225280. Its totient is φ = 14287536.

The previous prime is 18057943. The next prime is 18057959. The reversal of 18057949 is 94975081.

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 18057949 - 2⁹ = 18057437 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18057943) 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 in 7 ways as a sum of consecutive naturals, for example, 99129 + ... + 99310.

It is an arithmetic number, because the mean of its divisors is an integer number (2778160).

Almost surely, 2^18057949 is an apocalyptic number.

It is an amenable number.

18057949 is a deficient number, since it is larger than the sum of its proper divisors (4167331).

18057949 is a wasteful number, since it uses less digits than its factorization.

18057949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198459.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 18057949 is about 4249.4645545057. The cubic root of 18057949 is about 262.3550776772.

The spelling of 18057949 in words is "eighteen million, fifty-seven thousand, nine hundred forty-nine".