2181480 has 128 divisors (see below), whose sum is σ = 7776000. Its totient is φ = 489216.

The previous prime is 2181469. The next prime is 2181503. The reversal of 2181480 is 841812.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2181480.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41134 + ... + 41186.

It is an arithmetic number, because the mean of its divisors is an integer number (60750).

2^2181480 is an apocalyptic number.

2181480 is a gapful number since it is divisible by the number (20) 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 2181480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3888000).

2181480 is an abundant number, since it is smaller than the sum of its proper divisors (5594520).

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

2181480 is a wasteful number, since it uses less digits than its factorization.

2181480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 2181480 is about 1476.9834122291. The cubic root of 2181480 is about 129.6931619437.

The spelling of 2181480 in words is "two million, one hundred eighty-one thousand, four hundred eighty".