194434987 has 2 divisors, whose sum is σ = 194434988. Its totient is φ = 194434986.

The previous prime is 194434957. The next prime is 194434993. The reversal of 194434987 is 789434491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194434987 - 2¹¹ = 194432939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194434987.

It is not a weakly prime, because it can be changed into another prime (194434907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97217493 + 97217494.

It is an arithmetic number, because the mean of its divisors is an integer number (97217494).

Almost surely, 2^194434987 is an apocalyptic number.

194434987 is a deficient number, since it is larger than the sum of its proper divisors (1).

194434987 is an equidigital number, since it uses as much as digits as its factorization.

194434987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 194434987 is about 13943.9946571992. The cubic root of 194434987 is about 579.3283813301.

The spelling of 194434987 in words is "one hundred ninety-four million, four hundred thirty-four thousand, nine hundred eighty-seven".