1820884 has 36 divisors (see below), whose sum is σ = 3659124. Its totient is φ = 787968.

The previous prime is 1820869. The next prime is 1820891. The reversal of 1820884 is 4880281.

It can be written as a sum of positive squares in 2 ways, for example, as 521284 + 1299600 = 722^2 + 1140^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18724 + ... + 18820.

2^1820884 is an apocalyptic number.

It is an amenable number.

1820884 is an abundant number, since it is smaller than the sum of its proper divisors (1838240).

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

1820884 is a wasteful number, since it uses less digits than its factorization.

1820884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 1820884 is about 1349.4013487469. The cubic root of 1820884 is about 122.1126791994.

It can be divided in two parts, 1820 and 884, that added together give a square (2704 = 52²).

The spelling of 1820884 in words is "one million, eight hundred twenty thousand, eight hundred eighty-four".