1655559 has 16 divisors (see below), whose sum is σ = 2486240. Its totient is φ = 1102248.

The previous prime is 1655557. The next prime is 1655569. The reversal of 1655559 is 9555561.

It is not a de Polignac number, because 1655559 - 2¹ = 1655557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1809 + ... + 2565.

It is an arithmetic number, because the mean of its divisors is an integer number (155390).

2^1655559 is an apocalyptic number.

1655559 is a deficient number, since it is larger than the sum of its proper divisors (830681).

1655559 is an frugal number, since it uses more digits than its factorization.

1655559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 760 counting only the distinct ones).

The product of its digits is 33750, while the sum is 36.

The square root of 1655559 is about 1286.6852762039. The cubic root of 1655559 is about 118.2991309383.

The spelling of 1655559 in words is "one million, six hundred fifty-five thousand, five hundred fifty-nine".