1081540 has 24 divisors (see below), whose sum is σ = 2405592. Its totient is φ = 407040.

The previous prime is 1081513. The next prime is 1081541. The reversal of 1081540 is 451801.

It can be written as a sum of positive squares in 4 ways, for example, as 49284 + 1032256 = 222^2 + 1016^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081541) by changing a digit.

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, 1251 + ... + 1930.

It is an arithmetic number, because the mean of its divisors is an integer number (100233).

2^1081540 is an apocalyptic number.

1081540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1081540 is an abundant number, since it is smaller than the sum of its proper divisors (1324052).

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

1081540 is a wasteful number, since it uses less digits than its factorization.

1081540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207 (or 3205 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1081540 is about 1039.9711534461. The cubic root of 1081540 is about 102.6472996208.

It can be divided in two parts, 1081 and 540, that multiplied together give a triangular number (583740 = T₁₀₈₀).

The spelling of 1081540 in words is "one million, eighty-one thousand, five hundred forty".