194374204139 has 4 divisors (see below), whose sum is σ = 195360875424. Its totient is φ = 193387532856.

The previous prime is 194374204117. The next prime is 194374204169. The reversal of 194374204139 is 931402473491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194374204139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 194374204093 and 194374204102.

It is not an unprimeable number, because it can be changed into a prime (194374204169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493335347 + ... + 493335740.

It is an arithmetic number, because the mean of its divisors is an integer number (48840218856).

Almost surely, 2^194374204139 is an apocalyptic number.

194374204139 is a deficient number, since it is larger than the sum of its proper divisors (986671285).

194374204139 is an equidigital number, since it uses as much as digits as its factorization.

194374204139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986671284.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 194374204139 in words is "one hundred ninety-four billion, three hundred seventy-four million, two hundred four thousand, one hundred thirty-nine".