1655889 has 4 divisors (see below), whose sum is σ = 2207856. Its totient is φ = 1103924.

The previous prime is 1655873. The next prime is 1655891. The reversal of 1655889 is 9885561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1655889 - 2⁴ = 1655873 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1655889.

It is not an unprimeable number, because it can be changed into a prime (1655809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275979 + ... + 275984.

It is an arithmetic number, because the mean of its divisors is an integer number (551964).

2^1655889 is an apocalyptic number.

It is an amenable number.

1655889 is a deficient number, since it is larger than the sum of its proper divisors (551967).

1655889 is an equidigital number, since it uses as much as digits as its factorization.

1655889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551966.

The product of its digits is 86400, while the sum is 42.

The square root of 1655889 is about 1286.8135063015. The cubic root of 1655889 is about 118.3069905434.

The spelling of 1655889 in words is "one million, six hundred fifty-five thousand, eight hundred eighty-nine".