839436989 has 2 divisors, whose sum is σ = 839436990. Its totient is φ = 839436988.

The previous prime is 839436979. The next prime is 839437051. The reversal of 839436989 is 989634938.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 815102500 + 24334489 = 28550^2 + 4933^2 .

It is a cyclic number.

It is not a de Polignac number, because 839436989 - 2⁴ = 839436973 is a prime.

It is a super-2 number, since 2×839436989² = 1409308917002772242, 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 (839436979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419718494 + 419718495.

It is an arithmetic number, because the mean of its divisors is an integer number (419718495).

Almost surely, 2^839436989 is an apocalyptic number.

It is an amenable number.

839436989 is a deficient number, since it is larger than the sum of its proper divisors (1).

839436989 is an equidigital number, since it uses as much as digits as its factorization.

839436989 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 839436989 is about 28973.0390018030. The cubic root of 839436989 is about 943.3279462817.

The spelling of 839436989 in words is "eight hundred thirty-nine million, four hundred thirty-six thousand, nine hundred eighty-nine".