3947739 has 8 divisors (see below), whose sum is σ = 5302080. Its totient is φ = 2612616.

The previous prime is 3947693. The next prime is 3947747. The reversal of 3947739 is 9377493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3947739 - 2⁹ = 3947227 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 3947739.

It is not an unprimeable number, because it can be changed into a prime (3947759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4317 + ... + 5150.

It is an arithmetic number, because the mean of its divisors is an integer number (662760).

Almost surely, 2^3947739 is an apocalyptic number.

3947739 is a deficient number, since it is larger than the sum of its proper divisors (1354341).

3947739 is a wasteful number, since it uses less digits than its factorization.

3947739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9609.

The product of its digits is 142884, while the sum is 42.

The square root of 3947739 is about 1986.8917937321. The cubic root of 3947739 is about 158.0457459804.

The spelling of 3947739 in words is "three million, nine hundred forty-seven thousand, seven hundred thirty-nine".