1815480 has 96 divisors (see below), whose sum is σ = 6202800. Its totient is φ = 472320.

The previous prime is 1815467. The next prime is 1815491. The reversal of 1815480 is 845181.

1815480 is a `hidden beast` number, since 181 + 5 + 480 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44260 + ... + 44300.

2^1815480 is an apocalyptic number.

1815480 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 1815480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3101400).

1815480 is an abundant number, since it is smaller than the sum of its proper divisors (4387320).

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

1815480 is a wasteful number, since it uses less digits than its factorization.

1815480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1815480 is about 1347.3974914627. The cubic root of 1815480 is about 121.9917579311.

Subtracting from 1815480 its reverse (845181), we obtain a cube (970299 = 99³).

The spelling of 1815480 in words is "one million, eight hundred fifteen thousand, four hundred eighty".