18257009 has 8 divisors (see below), whose sum is σ = 19457280. Its totient is φ = 17090656.

The previous prime is 18256993. The next prime is 18257017. The reversal of 18257009 is 90075281.

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

It is not a de Polignac number, because 18257009 - 2⁴ = 18256993 is a prime.

It is a super-4 number, since 4×18257009⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18257039) 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, 7364 + ... + 9525.

It is an arithmetic number, because the mean of its divisors is an integer number (2432160).

Almost surely, 2^18257009 is an apocalyptic number.

It is an amenable number.

18257009 is a deficient number, since it is larger than the sum of its proper divisors (1200271).

18257009 is a wasteful number, since it uses less digits than its factorization.

18257009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16959.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 18257009 is about 4272.8221353106. The cubic root of 18257009 is about 263.3155719830.

The spelling of 18257009 in words is "eighteen million, two hundred fifty-seven thousand, nine".