193021138 has 8 divisors (see below), whose sum is σ = 291376332. Its totient is φ = 95895696.

The previous prime is 193021121. The next prime is 193021139. The reversal of 193021138 is 831120391.

It can be written as a sum of positive squares in 2 ways, for example, as 187881849 + 5139289 = 13707^2 + 2267^2 .

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 (193021139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307045 + ... + 307672.

Almost surely, 2^193021138 is an apocalyptic number.

193021138 is a deficient number, since it is larger than the sum of its proper divisors (98355194).

193021138 is a wasteful number, since it uses less digits than its factorization.

193021138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614876.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 193021138 is about 13893.2047418873. The cubic root of 193021138 is about 577.9207535739.

The spelling of 193021138 in words is "one hundred ninety-three million, twenty-one thousand, one hundred thirty-eight".