1890890 has 16 divisors (see below), whose sum is σ = 3426408. Its totient is φ = 751296.

The previous prime is 1890877. The next prime is 1890901. The reversal of 1890890 is 980981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1868689 + 22201 = 1367^2 + 149^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1890890.

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 7 ways as a sum of consecutive naturals, for example, 1184 + ... + 2276.

2^1890890 is an apocalyptic number.

1890890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1890890 is a deficient number, since it is larger than the sum of its proper divisors (1535518).

1890890 is a wasteful number, since it uses less digits than its factorization.

1890890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1890890 is about 1375.0963602599. The cubic root of 1890890 is about 123.6579630595.

Subtracting from 1890890 its reverse (980981), we obtain a palindrome (909909).

The spelling of 1890890 in words is "one million, eight hundred ninety thousand, eight hundred ninety".