1801240 has 48 divisors (see below), whose sum is σ = 4719600. Its totient is φ = 616896.

The previous prime is 1801237. The next prime is 1801259. The reversal of 1801240 is 421081.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 1501 + ... + 2419.

It is an arithmetic number, because the mean of its divisors is an integer number (98325).

2^1801240 is an apocalyptic number.

1801240 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 1801240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2359800).

1801240 is an abundant number, since it is smaller than the sum of its proper divisors (2918360).

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

1801240 is a wasteful number, since it uses less digits than its factorization.

1801240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1801240 is about 1342.1028276552. The cubic root of 1801240 is about 121.6719665755.

The spelling of 1801240 in words is "one million, eight hundred one thousand, two hundred forty".