1890920 has 32 divisors (see below), whose sum is σ = 4362120. Its totient is φ = 737280.

The previous prime is 1890913. The next prime is 1890923. The reversal of 1890920 is 290981.

It can be written as a sum of positive squares in 4 ways, for example, as 1304164 + 586756 = 1142^2 + 766^2 .

It is not an unprimeable number, because it can be changed into a prime (1890923) by changing a digit.

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, 1064 + ... + 2216.

2^1890920 is an apocalyptic number.

1890920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1890920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2181060).

1890920 is an abundant number, since it is smaller than the sum of its proper divisors (2471200).

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

1890920 is a wasteful number, since it uses less digits than its factorization.

1890920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1890920 is about 1375.1072685431. The cubic root of 1890920 is about 123.6586170230.

The spelling of 1890920 in words is "one million, eight hundred ninety thousand, nine hundred twenty".