3928809 has 8 divisors (see below), whose sum is σ = 5253952. Its totient is φ = 2611440.

The previous prime is 3928807. The next prime is 3928811. The reversal of 3928809 is 9088293.

It is an interprime number because it is at equal distance from previous prime (3928807) and next prime (3928811).

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

It is not a de Polignac number, because 3928809 - 2¹ = 3928807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3928807) 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, 637 + ... + 2874.

It is an arithmetic number, because the mean of its divisors is an integer number (656744).

Almost surely, 2^3928809 is an apocalyptic number.

It is an amenable number.

3928809 is a deficient number, since it is larger than the sum of its proper divisors (1325143).

3928809 is a wasteful number, since it uses less digits than its factorization.

3928809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 3928809 is about 1982.1223473842. The cubic root of 3928809 is about 157.7927234441.

The spelling of 3928809 in words is "three million, nine hundred twenty-eight thousand, eight hundred nine".