3913643 has 4 divisors (see below), whose sum is σ = 3996960. Its totient is φ = 3830328.

The previous prime is 3913633. The next prime is 3913667. The reversal of 3913643 is 3463193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3463193 = 73 ⋅47441.

It is a cyclic number.

It is not a de Polignac number, because 3913643 - 2⁴ = 3913627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3913633) 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, 41588 + ... + 41681.

It is an arithmetic number, because the mean of its divisors is an integer number (999240).

Almost surely, 2^3913643 is an apocalyptic number.

3913643 is a deficient number, since it is larger than the sum of its proper divisors (83317).

3913643 is an equidigital number, since it uses as much as digits as its factorization.

3913643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83316.

The product of its digits is 5832, while the sum is 29.

The square root of 3913643 is about 1978.2929510060. The cubic root of 3913643 is about 157.5894243163.

The spelling of 3913643 in words is "three million, nine hundred thirteen thousand, six hundred forty-three".