3928649 has 8 divisors (see below), whose sum is σ = 4379040. Its totient is φ = 3502656.

The previous prime is 3928637. The next prime is 3928651. The reversal of 3928649 is 9468293.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3928649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3928619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5759 + ... + 6404.

It is an arithmetic number, because the mean of its divisors is an integer number (547380).

Almost surely, 2^3928649 is an apocalyptic number.

It is an amenable number.

3928649 is a deficient number, since it is larger than the sum of its proper divisors (450391).

3928649 is a wasteful number, since it uses less digits than its factorization.

3928649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12199.

The product of its digits is 93312, while the sum is 41.

The square root of 3928649 is about 1982.0819861953. The cubic root of 3928649 is about 157.7905813888.

The spelling of 3928649 in words is "three million, nine hundred twenty-eight thousand, six hundred forty-nine".