3643967 has 4 divisors (see below), whose sum is σ = 3858336. Its totient is φ = 3429600.

The previous prime is 3643963. The next prime is 3643973. The reversal of 3643967 is 7693463.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7693463 = 397 ⋅19379.

It is a cyclic number.

It is not a de Polignac number, because 3643967 - 2² = 3643963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3643967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643961) 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, 107159 + ... + 107192.

It is an arithmetic number, because the mean of its divisors is an integer number (964584).

Almost surely, 2^3643967 is an apocalyptic number.

3643967 is a deficient number, since it is larger than the sum of its proper divisors (214369).

3643967 is a wasteful number, since it uses less digits than its factorization.

3643967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214368.

The product of its digits is 81648, while the sum is 38.

The square root of 3643967 is about 1908.9177562169. The cubic root of 3643967 is about 153.8832955133.

The spelling of 3643967 in words is "three million, six hundred forty-three thousand, nine hundred sixty-seven".