164747839 has 2 divisors, whose sum is σ = 164747840. Its totient is φ = 164747838.

The previous prime is 164747837. The next prime is 164747861. The reversal of 164747839 is 938747461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 164747839 - 2¹ = 164747837 is a prime.

Together with 164747837, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 164747792 and 164747801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164747837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82373919 + 82373920.

It is an arithmetic number, because the mean of its divisors is an integer number (82373920).

Almost surely, 2^164747839 is an apocalyptic number.

164747839 is a deficient number, since it is larger than the sum of its proper divisors (1).

164747839 is an equidigital number, since it uses as much as digits as its factorization.

164747839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 164747839 is about 12835.4134721091. The cubic root of 164747839 is about 548.2011078788.

The spelling of 164747839 in words is "one hundred sixty-four million, seven hundred forty-seven thousand, eight hundred thirty-nine".