194428079 has 2 divisors, whose sum is σ = 194428080. Its totient is φ = 194428078.

The previous prime is 194428067. The next prime is 194428097. The reversal of 194428079 is 970824491.

Together with next prime (194428097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194428079 - 2⁸ = 194427823 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194428019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97214039 + 97214040.

It is an arithmetic number, because the mean of its divisors is an integer number (97214040).

Almost surely, 2^194428079 is an apocalyptic number.

194428079 is a deficient number, since it is larger than the sum of its proper divisors (1).

194428079 is an equidigital number, since it uses as much as digits as its factorization.

194428079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 194428079 is about 13943.7469497980. The cubic root of 194428079 is about 579.3215203429.

It can be divided in two parts, 1944 and 28079, that multiplied together give a triangular number (54585576 = T₁₀₄₄₈).

The spelling of 194428079 in words is "one hundred ninety-four million, four hundred twenty-eight thousand, seventy-nine".