168138393 has 8 divisors (see below), whose sum is σ = 224556288. Its totient is φ = 111906384.

The previous prime is 168138371. The next prime is 168138403. The reversal of 168138393 is 393831861.

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

It is not a de Polignac number, because 168138393 - 2⁵ = 168138361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168138193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44346 + ... + 47987.

It is an arithmetic number, because the mean of its divisors is an integer number (28069536).

Almost surely, 2^168138393 is an apocalyptic number.

It is an amenable number.

168138393 is a deficient number, since it is larger than the sum of its proper divisors (56417895).

168138393 is an equidigital number, since it uses as much as digits as its factorization.

168138393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92943.

The product of its digits is 93312, while the sum is 42.

The square root of 168138393 is about 12966.8189236991. The cubic root of 168138393 is about 551.9363078949.

The spelling of 168138393 in words is "one hundred sixty-eight million, one hundred thirty-eight thousand, three hundred ninety-three".