3656971 has 4 divisors (see below), whose sum is σ = 3667000. Its totient is φ = 3646944.

The previous prime is 3656953. The next prime is 3656981. The reversal of 3656971 is 1796563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1796563 = 239 ⋅7517.

It is a cyclic number.

It is not a de Polignac number, because 3656971 - 2⁷ = 3656843 is a prime.

It is a Duffinian number.

3656971 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3656971.

It is not an unprimeable number, because it can be changed into a prime (3656981) 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, 4446 + ... + 5203.

It is an arithmetic number, because the mean of its divisors is an integer number (916750).

Almost surely, 2^3656971 is an apocalyptic number.

3656971 is a deficient number, since it is larger than the sum of its proper divisors (10029).

3656971 is an equidigital number, since it uses as much as digits as its factorization.

3656971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10028.

The product of its digits is 34020, while the sum is 37.

The square root of 3656971 is about 1912.3208412816. The cubic root of 3656971 is about 154.0661294672.

The spelling of 3656971 in words is "three million, six hundred fifty-six thousand, nine hundred seventy-one".