3656557 has 4 divisors (see below), whose sum is σ = 3667936. Its totient is φ = 3645180.

The previous prime is 3656551. The next prime is 3656561. The reversal of 3656557 is 7556563.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7556563 = 7 ⋅1079509.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3656557 is a prime.

It is a Duffinian number.

3656557 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656551) 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, 5193 + ... + 5854.

It is an arithmetic number, because the mean of its divisors is an integer number (916984).

Almost surely, 2^3656557 is an apocalyptic number.

It is an amenable number.

3656557 is a deficient number, since it is larger than the sum of its proper divisors (11379).

3656557 is a wasteful number, since it uses less digits than its factorization.

3656557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11378.

The product of its digits is 94500, while the sum is 37.

The square root of 3656557 is about 1912.2125927836. The cubic root of 3656557 is about 154.0603153855.

The spelling of 3656557 in words is "three million, six hundred fifty-six thousand, five hundred fifty-seven".