18400245 has 8 divisors (see below), whose sum is σ = 29440416. Its totient is φ = 9813456.

The previous prime is 18400241. The next prime is 18400247. The reversal of 18400245 is 54200481.

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

It is not a de Polignac number, because 18400245 - 2² = 18400241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18400241) 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, 613327 + ... + 613356.

It is an arithmetic number, because the mean of its divisors is an integer number (3680052).

Almost surely, 2^18400245 is an apocalyptic number.

18400245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18400245 is a deficient number, since it is larger than the sum of its proper divisors (11040171).

18400245 is a wasteful number, since it uses less digits than its factorization.

18400245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226691.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 18400245 is about 4289.5506757701. The cubic root of 18400245 is about 264.0023960985.

The spelling of 18400245 in words is "eighteen million, four hundred thousand, two hundred forty-five".