3947907 has 4 divisors (see below), whose sum is σ = 5263880. Its totient is φ = 2631936.

The previous prime is 3947903. The next prime is 3947921. The reversal of 3947907 is 7097493.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3947907 - 2² = 3947903 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3947903) 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, 657982 + ... + 657987.

It is an arithmetic number, because the mean of its divisors is an integer number (1315970).

Almost surely, 2^3947907 is an apocalyptic number.

3947907 is a deficient number, since it is larger than the sum of its proper divisors (1315973).

3947907 is a wasteful number, since it uses less digits than its factorization.

3947907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315972.

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 3947907 is about 1986.9340703707. The cubic root of 3947907 is about 158.0479878805.

The spelling of 3947907 in words is "three million, nine hundred forty-seven thousand, nine hundred seven".