1845990 has 80 divisors (see below), whose sum is σ = 5174928. Its totient is φ = 471744.

The previous prime is 1845959. The next prime is 1846001. The reversal of 1845990 is 995481.

1845990 = 160² + 161² + ... + 212².

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 34804 + ... + 34856.

2^1845990 is an apocalyptic number.

1845990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1845990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2587464).

1845990 is an abundant number, since it is smaller than the sum of its proper divisors (3328938).

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

1845990 is a wasteful number, since it uses less digits than its factorization.

1845990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1845990 is about 1358.6721458836. The cubic root of 1845990 is about 122.6713415174.

The spelling of 1845990 in words is "one million, eight hundred forty-five thousand, nine hundred ninety".