1820993 has 4 divisors (see below), whose sum is σ = 1848240. Its totient is φ = 1793748.

The previous prime is 1820983. The next prime is 1820999. The reversal of 1820993 is 3990281.

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 1820993 - 2⁴ = 1820977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1820999) 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, 13523 + ... + 13656.

It is an arithmetic number, because the mean of its divisors is an integer number (462060).

2^1820993 is an apocalyptic number.

It is an amenable number.

1820993 is a deficient number, since it is larger than the sum of its proper divisors (27247).

1820993 is an equidigital number, since it uses as much as digits as its factorization.

1820993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27246.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1820993 is about 1349.4417364229. The cubic root of 1820993 is about 122.1151157479.

The spelling of 1820993 in words is "one million, eight hundred twenty thousand, nine hundred ninety-three".