2006557 has 4 divisors (see below), whose sum is σ = 2293216. Its totient is φ = 1719900.

The previous prime is 2006549. The next prime is 2006573. The reversal of 2006557 is 7556002.

It is a happy number.

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 not a de Polignac number, because 2006557 - 2³ = 2006549 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 (2006507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143319 + ... + 143332.

It is an arithmetic number, because the mean of its divisors is an integer number (573304).

2^2006557 is an apocalyptic number.

It is an amenable number.

2006557 is a deficient number, since it is larger than the sum of its proper divisors (286659).

2006557 is an equidigital number, since it uses as much as digits as its factorization.

2006557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286658.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 2006557 is about 1416.5299149683. The cubic root of 2006557 is about 126.1296431646.

The spelling of 2006557 in words is "two million, six thousand, five hundred fifty-seven".