1890028 has 18 divisors (see below), whose sum is σ = 3847956. Its totient is φ = 809928.

The previous prime is 1890023. The next prime is 1890029. The reversal of 1890028 is 8200981.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1889978 and 1890005.

It is not an unprimeable number, because it can be changed into a prime (1890023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4626 + ... + 5017.

2^1890028 is an apocalyptic number.

It is an amenable number.

1890028 is an abundant number, since it is smaller than the sum of its proper divisors (1957928).

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

1890028 is a wasteful number, since it uses less digits than its factorization.

1890028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9661 (or 9652 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1890028 is about 1374.7828919506. The cubic root of 1890028 is about 123.6391695520.

The spelling of 1890028 in words is "one million, eight hundred ninety thousand, twenty-eight".