1889820 has 36 divisors (see below), whose sum is σ = 5733000. Its totient is φ = 503904.

The previous prime is 1889819. The next prime is 1889831. The reversal of 1889820 is 289881.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 5070 + ... + 5429.

It is an arithmetic number, because the mean of its divisors is an integer number (159250).

2^1889820 is an apocalyptic number.

1889820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1889820 is an abundant number, since it is smaller than the sum of its proper divisors (3843180).

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

1889820 is a wasteful number, since it uses less digits than its factorization.

1889820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10514 (or 10509 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1889820 is about 1374.7072415609. The cubic root of 1889820 is about 123.6346338360.

The spelling of 1889820 in words is "one million, eight hundred eighty-nine thousand, eight hundred twenty".