3928428169 has 4 divisors (see below), whose sum is σ = 3928902660. Its totient is φ = 3927953680.

The previous prime is 3928428157. The next prime is 3928428191. The reversal of 3928428169 is 9618248293.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2028601600 + 1899826569 = 45040^2 + 43587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3928428169 is a prime.

It is a super-2 number, since 2×3928428169² = 30865095757985385122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3928428139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224602 + ... + 241459.

It is an arithmetic number, because the mean of its divisors is an integer number (982225665).

Almost surely, 2^3928428169 is an apocalyptic number.

It is an amenable number.

3928428169 is a deficient number, since it is larger than the sum of its proper divisors (474491).

3928428169 is an equidigital number, since it uses as much as digits as its factorization.

3928428169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474490.

The product of its digits is 1492992, while the sum is 52.

The square root of 3928428169 is about 62677.1742263481. The cubic root of 3928428169 is about 1577.8762484188.

The spelling of 3928428169 in words is "three billion, nine hundred twenty-eight million, four hundred twenty-eight thousand, one hundred sixty-nine".