194138985 has 16 divisors (see below), whose sum is σ = 310904640. Its totient is φ = 103446720.

The previous prime is 194138953. The next prime is 194139013. The reversal of 194138985 is 589831491.

194138985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 194138985 - 2⁵ = 194138953 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13170 + ... + 23700.

It is an arithmetic number, because the mean of its divisors is an integer number (19431540).

Almost surely, 2^194138985 is an apocalyptic number.

194138985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

194138985 is a deficient number, since it is larger than the sum of its proper divisors (116765655).

194138985 is a wasteful number, since it uses less digits than its factorization.

194138985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11768.

The product of its digits is 311040, while the sum is 48.

The square root of 194138985 is about 13933.3766546376. The cubic root of 194138985 is about 579.0342479615.

The spelling of 194138985 in words is "one hundred ninety-four million, one hundred thirty-eight thousand, nine hundred eighty-five".