193955138 has 8 divisors (see below), whose sum is σ = 313312188. Its totient is φ = 89517744.

The previous prime is 193955137. The next prime is 193955141. The reversal of 193955138 is 831559391.

It can be written as a sum of positive squares in 2 ways, for example, as 191075329 + 2879809 = 13823^2 + 1697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (193955137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3729881 + ... + 3729932.

Almost surely, 2^193955138 is an apocalyptic number.

193955138 is a deficient number, since it is larger than the sum of its proper divisors (119357050).

193955138 is a wasteful number, since it uses less digits than its factorization.

193955138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7459828.

The product of its digits is 145800, while the sum is 44.

The square root of 193955138 is about 13926.7777321245. Note that the first 4 decimals coincide. The cubic root of 193955138 is about 578.8514110273.

The spelling of 193955138 in words is "one hundred ninety-three million, nine hundred fifty-five thousand, one hundred thirty-eight".