1811480 has 64 divisors (see below), whose sum is σ = 4665600. Its totient is φ = 626560.

The previous prime is 1811473. The next prime is 1811489. The reversal of 1811480 is 841181.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1811489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10031 + ... + 10209.

It is an arithmetic number, because the mean of its divisors is an integer number (72900).

2^1811480 is an apocalyptic number.

1811480 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 1811480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2332800).

1811480 is an abundant number, since it is smaller than the sum of its proper divisors (2854120).

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

1811480 is a wasteful number, since it uses less digits than its factorization.

1811480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1811480 is about 1345.9123299829. The cubic root of 1811480 is about 121.9020982917.

Subtracting from 1811480 its reverse (841181), we obtain a cube (970299 = 99³).

It can be divided in two parts, 181 and 1480, that added together give a palindrome (1661).

The spelling of 1811480 in words is "one million, eight hundred eleven thousand, four hundred eighty".