919947789 has 6 divisors (see below), whose sum is σ = 1328813486. Its totient is φ = 613298520.

The previous prime is 919947737. The next prime is 919947797. The reversal of 919947789 is 987749919.

919947789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 916272900 + 3674889 = 30270^2 + 1917^2 .

It is not a de Polignac number, because 919947789 - 2²⁹ = 383076877 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 (919947799) 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, 51108202 + ... + 51108219.

Almost surely, 2^919947789 is an apocalyptic number.

It is an amenable number.

919947789 is a deficient number, since it is larger than the sum of its proper divisors (408865697).

919947789 is a wasteful number, since it uses less digits than its factorization.

919947789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102216427 (or 102216424 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 63.

The square root of 919947789 is about 30330.6410911474. The cubic root of 919947789 is about 972.5704273798.

The spelling of 919947789 in words is "nine hundred nineteen million, nine hundred forty-seven thousand, seven hundred eighty-nine".