1655040 has 72 divisors (see below), whose sum is σ = 5298048. Its totient is φ = 440320.

The previous prime is 1655039. The next prime is 1655051. The reversal of 1655040 is 405561.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1654998 and 1655016.

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, 3625 + ... + 4055.

It is an arithmetic number, because the mean of its divisors is an integer number (73584).

2^1655040 is an apocalyptic number.

1655040 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 1655040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2649024).

1655040 is an abundant number, since it is smaller than the sum of its proper divisors (3643008).

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

1655040 is an equidigital number, since it uses as much as digits as its factorization.

1655040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1655040 is about 1286.4835793744. The cubic root of 1655040 is about 118.2867678098.

The spelling of 1655040 in words is "one million, six hundred fifty-five thousand, forty".