394658398829 has 2 divisors, whose sum is σ = 394658398830. Its totient is φ = 394658398828.

The previous prime is 394658398819. The next prime is 394658398847. The reversal of 394658398829 is 928893856493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391037608900 + 3620789929 = 625330^2 + 60173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394658398829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394658398819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197329199414 + 197329199415.

It is an arithmetic number, because the mean of its divisors is an integer number (197329199415).

Almost surely, 2^394658398829 is an apocalyptic number.

It is an amenable number.

394658398829 is a deficient number, since it is larger than the sum of its proper divisors (1).

394658398829 is an equidigital number, since it uses as much as digits as its factorization.

394658398829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806215680, while the sum is 74.

The spelling of 394658398829 in words is "three hundred ninety-four billion, six hundred fifty-eight million, three hundred ninety-eight thousand, eight hundred twenty-nine".