1081640 has 32 divisors (see below), whose sum is σ = 2782080. Its totient is φ = 370752.

The previous prime is 1081637. The next prime is 1081657. The reversal of 1081640 is 461801.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 1652 + ... + 2211.

It is an arithmetic number, because the mean of its divisors is an integer number (86940).

2^1081640 is an apocalyptic number.

1081640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1081640 is an abundant number, since it is smaller than the sum of its proper divisors (1700440).

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

1081640 is a wasteful number, since it uses less digits than its factorization.

1081640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881 (or 3877 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1081640 is about 1040.0192305914. The cubic root of 1081640 is about 102.6504631387.

The spelling of 1081640 in words is "one million, eighty-one thousand, six hundred forty".