18201845 has 4 divisors (see below), whose sum is σ = 21842220. Its totient is φ = 14561472.

The previous prime is 18201839. The next prime is 18201881. The reversal of 18201845 is 54810281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8254129 + 9947716 = 2873^2 + 3154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18201845 is a prime.

It is a super-2 number, since 2×18201845² = 662614322808050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820180 + ... + 1820189.

It is an arithmetic number, because the mean of its divisors is an integer number (5460555).

Almost surely, 2^18201845 is an apocalyptic number.

It is an amenable number.

18201845 is a deficient number, since it is larger than the sum of its proper divisors (3640375).

18201845 is an equidigital number, since it uses as much as digits as its factorization.

18201845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640374.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18201845 is about 4266.3620333957. The cubic root of 18201845 is about 263.0500996087.

The spelling of 18201845 in words is "eighteen million, two hundred one thousand, eight hundred forty-five".