3928945 has 8 divisors (see below), whose sum is σ = 4726440. Its totient is φ = 3135360.

The previous prime is 3928937. The next prime is 3928961. The reversal of 3928945 is 5498293.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 51984 + 3876961 = 228^2 + 1969^2 .

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

It is not a de Polignac number, because 3928945 - 2³ = 3928937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3928898 and 3928907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2155 + ... + 3535.

It is an arithmetic number, because the mean of its divisors is an integer number (590805).

Almost surely, 2^3928945 is an apocalyptic number.

It is an amenable number.

3928945 is a deficient number, since it is larger than the sum of its proper divisors (797495).

3928945 is a wasteful number, since it uses less digits than its factorization.

3928945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955.

The product of its digits is 77760, while the sum is 40.

The square root of 3928945 is about 1982.1566537486. The cubic root of 3928945 is about 157.7945441453.

The spelling of 3928945 in words is "three million, nine hundred twenty-eight thousand, nine hundred forty-five".