1820097 has 8 divisors (see below), whose sum is σ = 2696480. Its totient is φ = 1213380.

The previous prime is 1820089. The next prime is 1820111. The reversal of 1820097 is 7900281.

It is not a de Polignac number, because 1820097 - 2³ = 1820089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 67411 = 1820097 / (1 + 8 + 2 + 0 + 0 + 9 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820097.

It is not an unprimeable number, because it can be changed into a prime (1820047) 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, 33679 + ... + 33732.

It is an arithmetic number, because the mean of its divisors is an integer number (337060).

2^1820097 is an apocalyptic number.

It is an amenable number.

1820097 is a deficient number, since it is larger than the sum of its proper divisors (876383).

1820097 is an equidigital number, since it uses as much as digits as its factorization.

1820097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67420 (or 67414 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1820097 is about 1349.1097064361. The cubic root of 1820097 is about 122.0950839861.

The spelling of 1820097 in words is "one million, eight hundred twenty thousand, ninety-seven".