394138123 has 4 divisors (see below), whose sum is σ = 406852288. Its totient is φ = 381423960.

The previous prime is 394138103. The next prime is 394138133. The reversal of 394138123 is 321831493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321831493 = 293 ⋅1098401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394138123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394138103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6357036 + ... + 6357097.

It is an arithmetic number, because the mean of its divisors is an integer number (101713072).

Almost surely, 2^394138123 is an apocalyptic number.

394138123 is a deficient number, since it is larger than the sum of its proper divisors (12714165).

394138123 is a wasteful number, since it uses less digits than its factorization.

394138123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12714164.

The product of its digits is 15552, while the sum is 34.

The square root of 394138123 is about 19852.9122045105. The cubic root of 394138123 is about 733.1893500838.

The spelling of 394138123 in words is "three hundred ninety-four million, one hundred thirty-eight thousand, one hundred twenty-three".