1801280 has 56 divisors (see below), whose sum is σ = 4629912. Its totient is φ = 663552.

The previous prime is 1801273. The next prime is 1801297. The reversal of 1801280 is 821081.

It can be written as a sum of positive squares in 4 ways, for example, as 16384 + 1784896 = 128^2 + 1336^2 .

It is a super-3 number, since 3×1801280³ = 17533351348371456000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3944 + ... + 4376.

It is an arithmetic number, because the mean of its divisors is an integer number (82677).

2^1801280 is an apocalyptic number.

1801280 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 1801280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2314956).

1801280 is an abundant number, since it is smaller than the sum of its proper divisors (2828632).

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

1801280 is a wasteful number, since it uses less digits than its factorization.

1801280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1801280 is about 1342.1177295603. The cubic root of 1801280 is about 121.6728672222.

It can be divided in two parts, 180 and 1280, that multiplied together give a square (230400 = 480²).

The spelling of 1801280 in words is "one million, eight hundred one thousand, two hundred eighty".