164839747 has 2 divisors, whose sum is σ = 164839748. Its totient is φ = 164839746.

The previous prime is 164839733. The next prime is 164839757. The reversal of 164839747 is 747938461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164839747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 164839747.

It is not a weakly prime, because it can be changed into another prime (164839757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82419873 + 82419874.

It is an arithmetic number, because the mean of its divisors is an integer number (82419874).

Almost surely, 2^164839747 is an apocalyptic number.

164839747 is a deficient number, since it is larger than the sum of its proper divisors (1).

164839747 is an equidigital number, since it uses as much as digits as its factorization.

164839747 is an evil number, because the sum of its binary digits is even.

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

The square root of 164839747 is about 12838.9932237695. The cubic root of 164839747 is about 548.3030307151.

The spelling of 164839747 in words is "one hundred sixty-four million, eight hundred thirty-nine thousand, seven hundred forty-seven".