1820868 has 48 divisors (see below), whose sum is σ = 4959360. Its totient is φ = 509184.

The previous prime is 1820857. The next prime is 1820869. The reversal of 1820868 is 8680281.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820869) 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, 4248 + ... + 4656.

It is an arithmetic number, because the mean of its divisors is an integer number (103320).

2^1820868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2479680).

1820868 is an abundant number, since it is smaller than the sum of its proper divisors (3138492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1820868 is a wasteful number, since it uses less digits than its factorization.

1820868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1820868 is about 1349.3954201790. The cubic root of 1820868 is about 122.1123215328.

The spelling of 1820868 in words is "one million, eight hundred twenty thousand, eight hundred sixty-eight".