1605040 has 20 divisors (see below), whose sum is σ = 3731904. Its totient is φ = 641984.

The previous prime is 1605031. The next prime is 1605041. The reversal of 1605040 is 405061.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1605041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9952 + ... + 10111.

2^1605040 is an apocalyptic number.

1605040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605040 is an abundant number, since it is smaller than the sum of its proper divisors (2126864).

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

1605040 is a wasteful number, since it uses less digits than its factorization.

1605040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20076 (or 20070 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1605040 is about 1266.9017325744. The cubic root of 1605040 is about 117.0833895495.

The spelling of 1605040 in words is "one million, six hundred five thousand, forty".