3971859 has 8 divisors (see below), whose sum is σ = 5350800. Its totient is φ = 2620416.

The previous prime is 3971843. The next prime is 3971861. The reversal of 3971859 is 9581793.

It is a happy number.

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

It is not a de Polignac number, because 3971859 - 2⁴ = 3971843 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.

3971859 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3971859.

It is not an unprimeable number, because it can be changed into a prime (3971809) 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, 6534 + ... + 7115.

It is an arithmetic number, because the mean of its divisors is an integer number (668850).

Almost surely, 2^3971859 is an apocalyptic number.

3971859 is a deficient number, since it is larger than the sum of its proper divisors (1378941).

3971859 is a wasteful number, since it uses less digits than its factorization.

3971859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13749.

The product of its digits is 68040, while the sum is 42.

The square root of 3971859 is about 1992.9523325960. The cubic root of 3971859 is about 158.3669700158.

The spelling of 3971859 in words is "three million, nine hundred seventy-one thousand, eight hundred fifty-nine".