3866440 has 16 divisors (see below), whose sum is σ = 8699580. Its totient is φ = 1546560.

The previous prime is 3866437. The next prime is 3866441. The reversal of 3866440 is 446683.

It can be written as a sum of positive squares in 2 ways, for example, as 3786916 + 79524 = 1946^2 + 282^2 .

It is not an unprimeable number, because it can be changed into a prime (3866441) 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, 48291 + ... + 48370.

Almost surely, 2^3866440 is an apocalyptic number.

It is an amenable number.

3866440 is an abundant number, since it is smaller than the sum of its proper divisors (4833140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3866440 is a wasteful number, since it uses less digits than its factorization.

3866440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96672 (or 96668 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 3866440 is about 1966.3265242579. The cubic root of 3866440 is about 156.9532904984.

The spelling of 3866440 in words is "three million, eight hundred sixty-six thousand, four hundred forty".