3555861 has 4 divisors (see below), whose sum is σ = 4741152. Its totient is φ = 2370572.

The previous prime is 3555859. The next prime is 3555883. The reversal of 3555861 is 1685553.

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 3555861 - 2¹ = 3555859 is a prime.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3555161) 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, 592641 + ... + 592646.

It is an arithmetic number, because the mean of its divisors is an integer number (1185288).

Almost surely, 2^3555861 is an apocalyptic number.

It is an amenable number.

3555861 is a deficient number, since it is larger than the sum of its proper divisors (1185291).

3555861 is a wasteful number, since it uses less digits than its factorization.

3555861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185290.

The product of its digits is 18000, while the sum is 33.

The square root of 3555861 is about 1885.6990746140. The cubic root of 3555861 is about 152.6329361312.

It can be divided in two parts, 355 and 5861, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 3555861 in words is "three million, five hundred fifty-five thousand, eight hundred sixty-one".