18270805 has 16 divisors (see below), whose sum is σ = 25403904. Its totient is φ = 12355200.

The previous prime is 18270803. The next prime is 18270817. The reversal of 18270805 is 50807281.

It is not a de Polignac number, because 18270805 - 2¹ = 18270803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18270803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021 + ... + 6130.

It is an arithmetic number, because the mean of its divisors is an integer number (1587744).

Almost surely, 2^18270805 is an apocalyptic number.

It is an amenable number.

18270805 is a deficient number, since it is larger than the sum of its proper divisors (7133099).

18270805 is an equidigital number, since it uses as much as digits as its factorization.

18270805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7236.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 18270805 is about 4274.4362201348. The cubic root of 18270805 is about 263.3818805259.

The spelling of 18270805 in words is "eighteen million, two hundred seventy thousand, eight hundred five".