1655940 has 96 divisors (see below), whose sum is σ = 5475456. Its totient is φ = 368640.

The previous prime is 1655939. The next prime is 1655947. The reversal of 1655940 is 495561.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1655898 and 1655907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8484 + ... + 8676.

It is an arithmetic number, because the mean of its divisors is an integer number (57036).

2^1655940 is an apocalyptic number.

1655940 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 1655940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2737728).

1655940 is an abundant number, since it is smaller than the sum of its proper divisors (3819516).

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

1655940 is a wasteful number, since it uses less digits than its factorization.

1655940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1655940 is about 1286.8333225403. The cubic root of 1655940 is about 118.3082051164.

It can be divided in two parts, 165 and 5940, that multiplied together give a square (980100 = 990²).

The spelling of 1655940 in words is "one million, six hundred fifty-five thousand, nine hundred forty".