3866649 has 8 divisors (see below), whose sum is σ = 5164992. Its totient is φ = 2573040.

The previous prime is 3866647. The next prime is 3866651. The reversal of 3866649 is 9466683.

It is an interprime number because it is at equal distance from previous prime (3866647) and next prime (3866651).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3866649 - 2¹ = 3866647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3866649.

It is not an unprimeable number, because it can be changed into a prime (3866647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1804 + ... + 3314.

It is an arithmetic number, because the mean of its divisors is an integer number (645624).

Almost surely, 2^3866649 is an apocalyptic number.

It is an amenable number.

3866649 is a deficient number, since it is larger than the sum of its proper divisors (1298343).

3866649 is a wasteful number, since it uses less digits than its factorization.

3866649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367.

The product of its digits is 186624, while the sum is 42.

The square root of 3866649 is about 1966.3796683245. The cubic root of 3866649 is about 156.9561184785.

The spelling of 3866649 in words is "three million, eight hundred sixty-six thousand, six hundred forty-nine".