1655643 has 12 divisors (see below), whose sum is σ = 2426984. Its totient is φ = 1003200.

The previous prime is 1655627. The next prime is 1655653. The reversal of 1655643 is 3465561.

It is not a de Polignac number, because 1655643 - 2⁴ = 1655627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1655643.

It is not an unprimeable number, because it can be changed into a prime (1655623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1918 + ... + 2643.

2^1655643 is an apocalyptic number.

1655643 is a deficient number, since it is larger than the sum of its proper divisors (771341).

1655643 is a wasteful number, since it uses less digits than its factorization.

1655643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586 (or 4575 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 1655643 is about 1286.7179178048. The cubic root of 1655643 is about 118.3011316641.

The spelling of 1655643 in words is "one million, six hundred fifty-five thousand, six hundred forty-three".