123944391 has 32 divisors (see below), whose sum is σ = 194112000. Its totient is φ = 77946624.

The previous prime is 123944383. The next prime is 123944411. The reversal of 123944391 is 193449321.

123944391 is a `hidden beast` number, since 123 + 9 + 443 + 91 = 666.

It is not a de Polignac number, because 123944391 - 2³ = 123944383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123944351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183831 + ... + 184503.

It is an arithmetic number, because the mean of its divisors is an integer number (6066000).

Almost surely, 2^123944391 is an apocalyptic number.

123944391 is a deficient number, since it is larger than the sum of its proper divisors (70167609).

123944391 is a wasteful number, since it uses less digits than its factorization.

123944391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060 (or 1054 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 123944391 is about 11133.0315278454. The cubic root of 123944391 is about 498.5885406476.

The spelling of 123944391 in words is "one hundred twenty-three million, nine hundred forty-four thousand, three hundred ninety-one".