3965647 has 4 divisors (see below), whose sum is σ = 4532176. Its totient is φ = 3399120.

The previous prime is 3965639. The next prime is 3965653. The reversal of 3965647 is 7465693.

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

It is a cyclic number.

It is not a de Polignac number, because 3965647 - 2³ = 3965639 is a prime.

It is a super-2 number, since 2×3965647² = 31452712257218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3965617) 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, 283254 + ... + 283267.

It is an arithmetic number, because the mean of its divisors is an integer number (1133044).

Almost surely, 2^3965647 is an apocalyptic number.

3965647 is a deficient number, since it is larger than the sum of its proper divisors (566529).

3965647 is an equidigital number, since it uses as much as digits as its factorization.

3965647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566528.

The product of its digits is 136080, while the sum is 40.

The square root of 3965647 is about 1991.3932308813. The cubic root of 3965647 is about 158.2843647891.

The spelling of 3965647 in words is "three million, nine hundred sixty-five thousand, six hundred forty-seven".