3928129 has 4 divisors (see below), whose sum is σ = 3948676. Its totient is φ = 3907584.

The previous prime is 3928123. The next prime is 3928151. The reversal of 3928129 is 9218293.

3928129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9218293 = 7 ⋅1316899.

It can be written as a sum of positive squares in 2 ways, for example, as 1199025 + 2729104 = 1095^2 + 1652^2 .

It is a cyclic number.

It is not a de Polignac number, because 3928129 - 2⁵ = 3928097 is a prime.

It is a Duffinian number.

3928129 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3928094 and 3928103.

It is not an unprimeable number, because it can be changed into a prime (3928123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9984 + ... + 10369.

It is an arithmetic number, because the mean of its divisors is an integer number (987169).

Almost surely, 2^3928129 is an apocalyptic number.

It is an amenable number.

3928129 is a deficient number, since it is larger than the sum of its proper divisors (20547).

3928129 is a wasteful number, since it uses less digits than its factorization.

3928129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20546.

The product of its digits is 7776, while the sum is 34.

The square root of 3928129 is about 1981.9508066549. The cubic root of 3928129 is about 157.7836193073.

The spelling of 3928129 in words is "three million, nine hundred twenty-eight thousand, one hundred twenty-nine".