3656243 has 4 divisors (see below), whose sum is σ = 3660360. Its totient is φ = 3652128.

The previous prime is 3656239. The next prime is 3656249. The reversal of 3656243 is 3426563.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3656243 - 2² = 3656239 is a prime.

It is a super-2 number, since 2×3656243² = 26736225750098, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3² + 6² + 5⁹ + 6⁸ + 2⁹ + 4⁷ + 3⁸ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3656249) 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, 113 + ... + 2706.

It is an arithmetic number, because the mean of its divisors is an integer number (915090).

Almost surely, 2^3656243 is an apocalyptic number.

3656243 is a deficient number, since it is larger than the sum of its proper divisors (4117).

3656243 is a wasteful number, since it uses less digits than its factorization.

3656243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4116.

The product of its digits is 12960, while the sum is 29.

The square root of 3656243 is about 1912.1304871792. The cubic root of 3656243 is about 154.0559053787.

The spelling of 3656243 in words is "three million, six hundred fifty-six thousand, two hundred forty-three".