3556665 has 36 divisors (see below), whose sum is σ = 7175844. Its totient is φ = 1624896.

The previous prime is 3556649. The next prime is 3556669. The reversal of 3556665 is 5666553.

It is a happy number.

3556665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1750329 + 1806336 = 1323^2 + 1344^2 .

It is not a de Polignac number, because 3556665 - 2⁴ = 3556649 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (3556669) 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 35 ways as a sum of consecutive naturals, for example, 1399 + ... + 3011.

It is an arithmetic number, because the mean of its divisors is an integer number (199329).

Almost surely, 2^3556665 is an apocalyptic number.

3556665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3556665 is an abundant number, since it is smaller than the sum of its proper divisors (3619179).

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

3556665 is a wasteful number, since it uses less digits than its factorization.

3556665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638 (or 1628 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 3556665 is about 1885.9122461027. The cubic root of 3556665 is about 152.6444389836.

The spelling of 3556665 in words is "three million, five hundred fifty-six thousand, six hundred sixty-five".