3993643 has 4 divisors (see below), whose sum is σ = 4002768. Its totient is φ = 3984520.

The previous prime is 3993631. The next prime is 3993653. The reversal of 3993643 is 3463993.

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 3993643 - 2¹³ = 3985451 is a prime.

It is a super-2 number, since 2×3993643² = 31898368822898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3993653) 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, 3871 + ... + 4792.

It is an arithmetic number, because the mean of its divisors is an integer number (1000692).

Almost surely, 2^3993643 is an apocalyptic number.

3993643 is a deficient number, since it is larger than the sum of its proper divisors (9125).

3993643 is an equidigital number, since it uses as much as digits as its factorization.

3993643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9124.

The product of its digits is 52488, while the sum is 37.

The square root of 3993643 is about 1998.4101180689. The cubic root of 3993643 is about 158.6559680387.

The spelling of 3993643 in words is "three million, nine hundred ninety-three thousand, six hundred forty-three".