1820853 has 16 divisors (see below), whose sum is σ = 2856960. Its totient is φ = 1142208.

The previous prime is 1820843. The next prime is 1820857. The reversal of 1820853 is 3580281.

It is a happy number.

It is not a de Polignac number, because 1820853 - 2⁴ = 1820837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1525 + ... + 2442.

It is an arithmetic number, because the mean of its divisors is an integer number (178560).

2^1820853 is an apocalyptic number.

It is an amenable number.

1820853 is a deficient number, since it is larger than the sum of its proper divisors (1036107).

1820853 is a wasteful number, since it uses less digits than its factorization.

1820853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993 (or 3987 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1820853 is about 1349.3898621229. The cubic root of 1820853 is about 122.1119862183. Note that the first 3 decimals are identical.

The spelling of 1820853 in words is "one million, eight hundred twenty thousand, eight hundred fifty-three".