8899779389 has 2 divisors, whose sum is σ = 8899779390. Its totient is φ = 8899779388.

The previous prime is 8899779373. The next prime is 8899779419. The reversal of 8899779389 is 9839779988.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8477805625 + 421973764 = 92075^2 + 20542^2 .

It is a cyclic number.

It is not a de Polignac number, because 8899779389 - 2⁴ = 8899779373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8899779319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4449889694 + 4449889695.

It is an arithmetic number, because the mean of its divisors is an integer number (4449889695).

Almost surely, 2^8899779389 is an apocalyptic number.

It is an amenable number.

8899779389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8899779389 is an equidigital number, since it uses as much as digits as its factorization.

8899779389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493807104, while the sum is 77.

The square root of 8899779389 is about 94338.6420773587. The cubic root of 8899779389 is about 2072.3339749422. Note that the first 3 decimals are identical.

The spelling of 8899779389 in words is "eight billion, eight hundred ninety-nine million, seven hundred seventy-nine thousand, three hundred eighty-nine".