1890990 has 24 divisors (see below), whose sum is σ = 4916808. Its totient is φ = 504240.

The previous prime is 1890953. The next prime is 1890997. The reversal of 1890990 is 990981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890997) 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 11 ways as a sum of consecutive naturals, for example, 10416 + ... + 10595.

It is an arithmetic number, because the mean of its divisors is an integer number (204867).

2^1890990 is an apocalyptic number.

1890990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1890990 is an abundant number, since it is smaller than the sum of its proper divisors (3025818).

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

1890990 is a wasteful number, since it uses less digits than its factorization.

1890990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21024 (or 21021 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1890990 is about 1375.1327208673. The cubic root of 1890990 is about 123.6601429110.

Subtracting from 1890990 its reverse (990981), we obtain a palindrome (900009).

The spelling of 1890990 in words is "one million, eight hundred ninety thousand, nine hundred ninety".