3917864 has 8 divisors (see below), whose sum is σ = 7346010. Its totient is φ = 1958928.

The previous prime is 3917863. The next prime is 3917909. The reversal of 3917864 is 4687193.

It can be written as a sum of positive squares in only one way, i.e., 3833764 + 84100 = 1958^2 + 290^2 .

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

It is not an unprimeable number, because it can be changed into a prime (3917863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244859 + ... + 244874.

Almost surely, 2^3917864 is an apocalyptic number.

It is an amenable number.

3917864 is a deficient number, since it is larger than the sum of its proper divisors (3428146).

3917864 is a wasteful number, since it uses less digits than its factorization.

3917864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489739 (or 489735 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 3917864 is about 1979.3594923611. The cubic root of 3917864 is about 157.6460591841.

It can be divided in two parts, 39 and 17864, that multiplied together give a palindrome (696696).

The spelling of 3917864 in words is "three million, nine hundred seventeen thousand, eight hundred sixty-four".