1808997 has 4 divisors (see below), whose sum is σ = 2412000. Its totient is φ = 1205996.

The previous prime is 1808993. The next prime is 1809029. The reversal of 1808997 is 7998081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1808997 - 2² = 1808993 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301497 + ... + 301502.

It is an arithmetic number, because the mean of its divisors is an integer number (603000).

2^1808997 is an apocalyptic number.

It is an amenable number.

1808997 is a deficient number, since it is larger than the sum of its proper divisors (603003).

1808997 is an equidigital number, since it uses as much as digits as its factorization.

1808997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603002.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1808997 is about 1344.9895910378. The cubic root of 1808997 is about 121.8463756576.

The spelling of 1808997 in words is "one million, eight hundred eight thousand, nine hundred ninety-seven".