1820945 has 8 divisors (see below), whose sum is σ = 2497344. Its totient is φ = 1248624.

The previous prime is 1820927. The next prime is 1820947. The reversal of 1820945 is 5490281.

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 1820945 - 2¹² = 1816849 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25979 + ... + 26048.

It is an arithmetic number, because the mean of its divisors is an integer number (312168).

2^1820945 is an apocalyptic number.

It is an amenable number.

1820945 is a deficient number, since it is larger than the sum of its proper divisors (676399).

1820945 is an equidigital number, since it uses as much as digits as its factorization.

1820945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52039.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1820945 is about 1349.4239511732. The cubic root of 1820945 is about 122.1140427844.

The spelling of 1820945 in words is "one million, eight hundred twenty thousand, nine hundred forty-five".