194639927039 has 4 divisors (see below), whose sum is σ = 195273933624. Its totient is φ = 194005920456.

The previous prime is 194639926997. The next prime is 194639927051. The reversal of 194639927039 is 930729936491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930729936491 = 4663 ⋅199598957.

It is a cyclic number.

It is not a de Polignac number, because 194639927039 - 2⁸ = 194639926783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194639927089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317002832 + ... + 317003445.

It is an arithmetic number, because the mean of its divisors is an integer number (48818483406).

Almost surely, 2^194639927039 is an apocalyptic number.

194639927039 is a deficient number, since it is larger than the sum of its proper divisors (634006585).

194639927039 is an equidigital number, since it uses as much as digits as its factorization.

194639927039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634006584.

The product of its (nonzero) digits is 19840464, while the sum is 62.

The spelling of 194639927039 in words is "one hundred ninety-four billion, six hundred thirty-nine million, nine hundred twenty-seven thousand, thirty-nine".