1820673 has 12 divisors (see below), whose sum is σ = 2660580. Its totient is φ = 1199616.

The previous prime is 1820671. The next prime is 1820677. The reversal of 1820673 is 3760281.

It can be written as a sum of positive squares in 2 ways, for example, as 1016064 + 804609 = 1008^2 + 897^2 .

It is not a de Polignac number, because 1820673 - 2¹ = 1820671 is a prime.

1820673 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1820671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 336 + ... + 1937.

It is an arithmetic number, because the mean of its divisors is an integer number (221715).

It is a Proth number, since it is equal to 889 ⋅ 2¹¹ + 1 and 889 < 2¹¹.

2^1820673 is an apocalyptic number.

It is an amenable number.

1820673 is a deficient number, since it is larger than the sum of its proper divisors (839907).

1820673 is a wasteful number, since it uses less digits than its factorization.

1820673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368 (or 2365 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1820673 is about 1349.3231636639. The cubic root of 1820673 is about 122.1079623017.

The spelling of 1820673 in words is "one million, eight hundred twenty thousand, six hundred seventy-three".