3928005 has 24 divisors (see below), whose sum is σ = 6977880. Its totient is φ = 2042880.

The previous prime is 3927997. The next prime is 3928013. The reversal of 3928005 is 5008293.

It is an interprime number because it is at equal distance from previous prime (3927997) and next prime (3928013).

It can be written as a sum of positive squares in 4 ways, for example, as 31329 + 3896676 = 177^2 + 1974^2 .

It is not a de Polignac number, because 3928005 - 2³ = 3927997 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3928005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 781 + ... + 2909.

It is an arithmetic number, because the mean of its divisors is an integer number (290745).

Almost surely, 2^3928005 is an apocalyptic number.

It is an amenable number.

3928005 is a deficient number, since it is larger than the sum of its proper divisors (3049875).

3928005 is a wasteful number, since it uses less digits than its factorization.

3928005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181 (or 2178 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 3928005 is about 1981.9195240978. The cubic root of 3928005 is about 157.7819590280.

The spelling of 3928005 in words is "three million, nine hundred twenty-eight thousand, five".