3656789 has 4 divisors (see below), whose sum is σ = 3706956. Its totient is φ = 3606624.

The previous prime is 3656777. The next prime is 3656801. The reversal of 3656789 is 9876563.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3656777) and next prime (3656801).

It can be written as a sum of positive squares in 2 ways, for example, as 917764 + 2739025 = 958^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656789 - 2⁴ = 3656773 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656089) 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, 24974 + ... + 25119.

It is an arithmetic number, because the mean of its divisors is an integer number (926739).

Almost surely, 2^3656789 is an apocalyptic number.

It is an amenable number.

3656789 is a deficient number, since it is larger than the sum of its proper divisors (50167).

3656789 is an equidigital number, since it uses as much as digits as its factorization.

3656789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50166.

The product of its digits is 272160, while the sum is 44.

The square root of 3656789 is about 1912.2732545324. The cubic root of 3656789 is about 154.0635735723.

The spelling of 3656789 in words is "three million, six hundred fifty-six thousand, seven hundred eighty-nine".