1805597985 has 16 divisors (see below), whose sum is σ = 2896030080. Its totient is φ = 960627840.

The previous prime is 1805597977. The next prime is 1805598023. The reversal of 1805597985 is 5897955081.

It is not a de Polignac number, because 1805597985 - 2³ = 1805597977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141021 + ... + 153290.

It is an arithmetic number, because the mean of its divisors is an integer number (181001880).

Almost surely, 2^1805597985 is an apocalyptic number.

1805597985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1805597985 is a deficient number, since it is larger than the sum of its proper divisors (1090432095).

1805597985 is a wasteful number, since it uses less digits than its factorization.

1805597985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294728.

The product of its (nonzero) digits is 4536000, while the sum is 57.

The square root of 1805597985 is about 42492.3285429264. The cubic root of 1805597985 is about 1217.7001339290.

The spelling of 1805597985 in words is "one billion, eight hundred five million, five hundred ninety-seven thousand, nine hundred eighty-five".