194373139 has 4 divisors (see below), whose sum is σ = 195222160. Its totient is φ = 193524120.

The previous prime is 194373133. The next prime is 194373149. The reversal of 194373139 is 931373491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931373491 = 191 ⋅4876301.

It is a cyclic number.

It is not a de Polignac number, because 194373139 - 2¹⁵ = 194340371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194373133) 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, 424167 + ... + 424624.

It is an arithmetic number, because the mean of its divisors is an integer number (48805540).

Almost surely, 2^194373139 is an apocalyptic number.

194373139 is a deficient number, since it is larger than the sum of its proper divisors (849021).

194373139 is an equidigital number, since it uses as much as digits as its factorization.

194373139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849020.

The product of its digits is 61236, while the sum is 40.

The square root of 194373139 is about 13941.7767519065. The cubic root of 194373139 is about 579.2669484538.

The spelling of 194373139 in words is "one hundred ninety-four million, three hundred seventy-three thousand, one hundred thirty-nine".