1822840 has 32 divisors (see below), whose sum is σ = 4140000. Its totient is φ = 722304.

The previous prime is 1822837. The next prime is 1822867. The reversal of 1822840 is 482281.

1822840 = 330² + 331² + ... + 345².

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 7 ways as a sum of consecutive naturals, for example, 7846 + ... + 8074.

It is an arithmetic number, because the mean of its divisors is an integer number (129375).

2^1822840 is an apocalyptic number.

1822840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1822840 is an abundant number, since it is smaller than the sum of its proper divisors (2317160).

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

1822840 is a wasteful number, since it uses less digits than its factorization.

1822840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 1822840 is about 1350.1259200534. The cubic root of 1822840 is about 122.1563881756.

It can be divided in two parts, 1822 and 840, that added together give a palindrome (2662).

The spelling of 1822840 in words is "one million, eight hundred twenty-two thousand, eight hundred forty".