3967864 has 8 divisors (see below), whose sum is σ = 7439760. Its totient is φ = 1983928.

The previous prime is 3967841. The next prime is 3967871. The reversal of 3967864 is 4687693.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3967864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247984 + ... + 247999.

It is an arithmetic number, because the mean of its divisors is an integer number (929970).

Almost surely, 2^3967864 is an apocalyptic number.

It is an amenable number.

3967864 is a deficient number, since it is larger than the sum of its proper divisors (3471896).

3967864 is a wasteful number, since it uses less digits than its factorization.

3967864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495989 (or 495985 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 3967864 is about 1991.9497985642. The cubic root of 3967864 is about 158.3138556526.

The spelling of 3967864 in words is "three million, nine hundred sixty-seven thousand, eight hundred sixty-four".