834639989 has 2 divisors, whose sum is σ = 834639990. Its totient is φ = 834639988.

The previous prime is 834639983. The next prime is 834640021. The reversal of 834639989 is 989936438.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 821280964 + 13359025 = 28658^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 834639989 - 2¹⁶ = 834574453 is a prime.

It is a super-2 number, since 2×834639989² = 1393247822475840242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (834639983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417319994 + 417319995.

It is an arithmetic number, because the mean of its divisors is an integer number (417319995).

Almost surely, 2^834639989 is an apocalyptic number.

It is an amenable number.

834639989 is a deficient number, since it is larger than the sum of its proper divisors (1).

834639989 is an equidigital number, since it uses as much as digits as its factorization.

834639989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 59.

The square root of 834639989 is about 28890.1365348106. The cubic root of 834639989 is about 941.5276160603.

The spelling of 834639989 in words is "eight hundred thirty-four million, six hundred thirty-nine thousand, nine hundred eighty-nine".