1800997 has 8 divisors (see below), whose sum is σ = 2080512. Its totient is φ = 1540800.

The previous prime is 1800979. The next prime is 1801003. The reversal of 1800997 is 7990081.

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 1800997 - 2¹⁵ = 1768229 is a prime.

It is a Duffinian number.

1800997 is a lucky number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800907) 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, 4629 + ... + 5002.

It is an arithmetic number, because the mean of its divisors is an integer number (260064).

2^1800997 is an apocalyptic number.

1800997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1800997 is a deficient number, since it is larger than the sum of its proper divisors (279515).

1800997 is a wasteful number, since it uses less digits than its factorization.

1800997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9659.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1800997 is about 1342.0122950256. The cubic root of 1800997 is about 121.6664948602. Note that the first 3 decimals are identical.

The spelling of 1800997 in words is "one million, eight hundred thousand, nine hundred ninety-seven".