18280385 has 8 divisors (see below), whose sum is σ = 22015680. Its totient is φ = 14571504.

The previous prime is 18280369. The next prime is 18280397. The reversal of 18280385 is 58308281.

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 18280385 - 2⁴ = 18280369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5045 + ... + 7874.

It is an arithmetic number, because the mean of its divisors is an integer number (2751960).

Almost surely, 2^18280385 is an apocalyptic number.

It is an amenable number.

18280385 is a deficient number, since it is larger than the sum of its proper divisors (3735295).

18280385 is a wasteful number, since it uses less digits than its factorization.

18280385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13207.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 18280385 is about 4275.5566889003. The cubic root of 18280385 is about 263.4279058204.

The spelling of 18280385 in words is "eighteen million, two hundred eighty thousand, three hundred eighty-five".