1891306916 has 12 divisors (see below), whose sum is σ = 3504480588. Its totient is φ = 890026752.

The previous prime is 1891306889. The next prime is 1891306919. The reversal of 1891306916 is 6196031981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 734626816 + 1156680100 = 27104^2 + 34010^2 .

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1891306919) 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, 13906601 + ... + 13906736.

It is an arithmetic number, because the mean of its divisors is an integer number (292040049).

Almost surely, 2^1891306916 is an apocalyptic number.

It is an amenable number.

1891306916 is a deficient number, since it is larger than the sum of its proper divisors (1613173672).

1891306916 is a wasteful number, since it uses less digits than its factorization.

1891306916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27813358 (or 27813356 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1891306916 is about 43489.1586030358. The cubic root of 1891306916 is about 1236.6705070156.

The spelling of 1891306916 in words is "one billion, eight hundred ninety-one million, three hundred six thousand, nine hundred sixteen".