194389939 has 2 divisors, whose sum is σ = 194389940. Its totient is φ = 194389938.

The previous prime is 194389927. The next prime is 194389957. The reversal of 194389939 is 939983491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194389939 - 2⁹ = 194389427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194389939.

It is not a weakly prime, because it can be changed into another prime (194389919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97194969 + 97194970.

It is an arithmetic number, because the mean of its divisors is an integer number (97194970).

Almost surely, 2^194389939 is an apocalyptic number.

194389939 is a deficient number, since it is larger than the sum of its proper divisors (1).

194389939 is an equidigital number, since it uses as much as digits as its factorization.

194389939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 55.

The square root of 194389939 is about 13942.3792445909. The cubic root of 194389939 is about 579.2836369812.

The spelling of 194389939 in words is "one hundred ninety-four million, three hundred eighty-nine thousand, nine hundred thirty-nine".