1628930393 has 4 divisors (see below), whose sum is σ = 1631071668. Its totient is φ = 1626789120.

The previous prime is 1628930383. The next prime is 1628930419. The reversal of 1628930393 is 3930398261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3930398261 = 26849 ⋅146389.

It can be written as a sum of positive squares in 2 ways, for example, as 842857024 + 786073369 = 29032^2 + 28037^2 .

It is a cyclic number.

It is not a de Polignac number, because 1628930393 - 2¹⁶ = 1628864857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628930333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069496 + ... + 1071017.

It is an arithmetic number, because the mean of its divisors is an integer number (407767917).

Almost surely, 2^1628930393 is an apocalyptic number.

It is an amenable number.

1628930393 is a deficient number, since it is larger than the sum of its proper divisors (2141275).

1628930393 is an equidigital number, since it uses as much as digits as its factorization.

1628930393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141274.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 1628930393 is about 40360.0098240821. The cubic root of 1628930393 is about 1176.6144442133.

The spelling of 1628930393 in words is "one billion, six hundred twenty-eight million, nine hundred thirty thousand, three hundred ninety-three".