3556997 has 4 divisors (see below), whose sum is σ = 3589740. Its totient is φ = 3524256.

The previous prime is 3556991. The next prime is 3556999. The reversal of 3556997 is 7996553.

It is a Cunningham number, because it is equal to 1886²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7996553 = 137 ⋅58369.

It can be written as a sum of positive squares in 2 ways, for example, as 2477476 + 1079521 = 1574^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 3556997 - 2⁴ = 3556981 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 (3556991) 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, 16208 + ... + 16425.

It is an arithmetic number, because the mean of its divisors is an integer number (897435).

Almost surely, 2^3556997 is an apocalyptic number.

It is an amenable number.

3556997 is a deficient number, since it is larger than the sum of its proper divisors (32743).

3556997 is a wasteful number, since it uses less digits than its factorization.

3556997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32742.

The product of its digits is 255150, while the sum is 44.

The square root of 3556997 is about 1886.0002651113. Note that the first 3 decimals coincide. The cubic root of 3556997 is about 152.6491884120.

The spelling of 3556997 in words is "three million, five hundred fifty-six thousand, nine hundred ninety-seven".