1916628893 has 6 divisors (see below), whose sum is σ = 2003584254. Its totient is φ = 1833296696.

The previous prime is 1916628887. The next prime is 1916628907. The reversal of 1916628893 is 3988266191.

It can be written as a sum of positive squares in only one way, i.e., 1734972409 + 181656484 = 41653^2 + 13478^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1916628893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916628863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1811030 + ... + 1812087.

It is an arithmetic number, because the mean of its divisors is an integer number (333930709).

Almost surely, 2^1916628893 is an apocalyptic number.

It is an amenable number.

1916628893 is a deficient number, since it is larger than the sum of its proper divisors (86955361).

1916628893 is an equidigital number, since it uses as much as digits as its factorization.

1916628893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623163 (or 3623140 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 53.

The square root of 1916628893 is about 43779.3203807460. The cubic root of 1916628893 is about 1242.1651586493.

The spelling of 1916628893 in words is "one billion, nine hundred sixteen million, six hundred twenty-eight thousand, eight hundred ninety-three".