3947911 has 4 divisors (see below), whose sum is σ = 4306824. Its totient is φ = 3589000.

The previous prime is 3947903. The next prime is 3947921. The reversal of 3947911 is 1197493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1197493 = 11 ⋅108863.

It is a cyclic number.

It is not a de Polignac number, because 3947911 - 2³ = 3947903 is a prime.

It is a Duffinian number.

3947911 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947921) 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, 179440 + ... + 179461.

It is an arithmetic number, because the mean of its divisors is an integer number (1076706).

Almost surely, 2^3947911 is an apocalyptic number.

3947911 is a deficient number, since it is larger than the sum of its proper divisors (358913).

3947911 is a wasteful number, since it uses less digits than its factorization.

3947911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358912.

The product of its digits is 6804, while the sum is 34.

The square root of 3947911 is about 1986.9350769464. The cubic root of 3947911 is about 158.0480412583.

The spelling of 3947911 in words is "three million, nine hundred forty-seven thousand, nine hundred eleven".