1890280 has 64 divisors (see below), whose sum is σ = 5005440. Its totient is φ = 628992.

The previous prime is 1890277. The next prime is 1890283. The reversal of 1890280 is 820981.

It is an interprime number because it is at equal distance from previous prime (1890277) and next prime (1890283).

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

It is not an unprimeable number, because it can be changed into a prime (1890283) 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 15 ways as a sum of consecutive naturals, for example, 11962 + ... + 12118.

It is an arithmetic number, because the mean of its divisors is an integer number (78210).

2^1890280 is an apocalyptic number.

1890280 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 1890280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2502720).

1890280 is an abundant number, since it is smaller than the sum of its proper divisors (3115160).

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

1890280 is a wasteful number, since it uses less digits than its factorization.

1890280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 214 counting only the distinct ones).

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

The square root of 1890280 is about 1374.8745397308. The cubic root of 1890280 is about 123.6446643006.

The spelling of 1890280 in words is "one million, eight hundred ninety thousand, two hundred eighty".