3971613 has 4 divisors (see below), whose sum is σ = 5295488. Its totient is φ = 2647740.

The previous prime is 3971599. The next prime is 3971621. The reversal of 3971613 is 3161793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3971613 - 2⁵ = 3971581 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971213) 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, 661933 + ... + 661938.

It is an arithmetic number, because the mean of its divisors is an integer number (1323872).

Almost surely, 2^3971613 is an apocalyptic number.

It is an amenable number.

3971613 is a deficient number, since it is larger than the sum of its proper divisors (1323875).

3971613 is a wasteful number, since it uses less digits than its factorization.

3971613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323874.

The product of its digits is 3402, while the sum is 30.

The square root of 3971613 is about 1992.8906141582. The cubic root of 3971613 is about 158.3637004235.

The spelling of 3971613 in words is "three million, nine hundred seventy-one thousand, six hundred thirteen".