3989743 has 4 divisors (see below), whose sum is σ = 4001920. Its totient is φ = 3977568.

The previous prime is 3989729. The next prime is 3989759. The reversal of 3989743 is 3479893.

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 3989743 - 2¹⁷ = 3858671 is a prime.

It is a Duffinian number.

3989743 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3989743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989723) 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, 5583 + ... + 6256.

It is an arithmetic number, because the mean of its divisors is an integer number (1000480).

Almost surely, 2^3989743 is an apocalyptic number.

3989743 is a deficient number, since it is larger than the sum of its proper divisors (12177).

3989743 is a wasteful number, since it uses less digits than its factorization.

3989743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12176.

The product of its digits is 163296, while the sum is 43.

The square root of 3989743 is about 1997.4341040445. The cubic root of 3989743 is about 158.6043059513.

The spelling of 3989743 in words is "three million, nine hundred eighty-nine thousand, seven hundred forty-three".