3971915 has 4 divisors (see below), whose sum is σ = 4766304. Its totient is φ = 3177528.

The previous prime is 3971911. The next prime is 3971917. The reversal of 3971915 is 5191793.

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 3971915 - 2² = 3971911 is a prime.

It is a super-2 number, since 2×3971915² = 31552217534450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3971911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397187 + ... + 397196.

It is an arithmetic number, because the mean of its divisors is an integer number (1191576).

Almost surely, 2^3971915 is an apocalyptic number.

3971915 is a deficient number, since it is larger than the sum of its proper divisors (794389).

3971915 is an equidigital number, since it uses as much as digits as its factorization.

3971915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794388.

The product of its digits is 8505, while the sum is 35.

The square root of 3971915 is about 1992.9663820546. The cubic root of 3971915 is about 158.3677142944.

The spelling of 3971915 in words is "three million, nine hundred seventy-one thousand, nine hundred fifteen".