1805397 has 8 divisors (see below), whose sum is σ = 2626080. Its totient is φ = 1094160.

The previous prime is 1805393. The next prime is 1805413. The reversal of 1805397 is 7935081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1805397 - 2² = 1805393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 54709 = 1805397 / (1 + 8 + 0 + 5 + 3 + 9 + 7).

1805397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1805393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27322 + ... + 27387.

It is an arithmetic number, because the mean of its divisors is an integer number (328260).

2^1805397 is an apocalyptic number.

It is an amenable number.

1805397 is a deficient number, since it is larger than the sum of its proper divisors (820683).

1805397 is a wasteful number, since it uses less digits than its factorization.

1805397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54723.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1805397 is about 1343.6506242324. The cubic root of 1805397 is about 121.7654950644.

The spelling of 1805397 in words is "one million, eight hundred five thousand, three hundred ninety-seven".