123138381 has 8 divisors (see below), whose sum is σ = 164520864. Its totient is φ = 81924080.

The previous prime is 123138377. The next prime is 123138383. The reversal of 123138381 is 183831321.

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

It is a cyclic number.

It is not a de Polignac number, because 123138381 - 2² = 123138377 is a prime.

It is a super-2 number, since 2×123138381² = 30326121750602322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123138383) 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, 40326 + ... + 43271.

It is an arithmetic number, because the mean of its divisors is an integer number (20565108).

Almost surely, 2^123138381 is an apocalyptic number.

It is an amenable number.

123138381 is a deficient number, since it is larger than the sum of its proper divisors (41382483).

123138381 is an equidigital number, since it uses as much as digits as its factorization.

123138381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84091.

The product of its digits is 3456, while the sum is 30.

The square root of 123138381 is about 11096.7734499718. The cubic root of 123138381 is about 497.5054161342.

The spelling of 123138381 in words is "one hundred twenty-three million, one hundred thirty-eight thousand, three hundred eighty-one".