1081520 has 40 divisors (see below), whose sum is σ = 2745360. Its totient is φ = 392960.

The previous prime is 1081513. The next prime is 1081541. The reversal of 1081520 is 251801.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 1494.

It is an arithmetic number, because the mean of its divisors is an integer number (68634).

2^1081520 is an apocalyptic number.

1081520 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 1081520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1372680).

1081520 is an abundant number, since it is smaller than the sum of its proper divisors (1663840).

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

1081520 is a wasteful number, since it uses less digits than its factorization.

1081520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1081520 is about 1039.9615377503. The cubic root of 1081520 is about 102.6466668938.

Adding to 1081520 its product of nonzero digits (80), we get a square (1081600 = 1040²).

The spelling of 1081520 in words is "one million, eighty-one thousand, five hundred twenty".