1655904 has 48 divisors (see below), whose sum is σ = 4451328. Its totient is φ = 538752.

The previous prime is 1655897. The next prime is 1655909. The reversal of 1655904 is 4095561.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655909) 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 7 ways as a sum of consecutive naturals, for example, 4329 + ... + 4695.

It is an arithmetic number, because the mean of its divisors is an integer number (92736).

2^1655904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1655904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2225664).

1655904 is an abundant number, since it is smaller than the sum of its proper divisors (2795424).

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

1655904 is a wasteful number, since it uses less digits than its factorization.

1655904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 419 counting only the distinct ones).

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

The square root of 1655904 is about 1286.8193346387. The cubic root of 1655904 is about 118.3073477733.

The spelling of 1655904 in words is "one million, six hundred fifty-five thousand, nine hundred four".