123109436 has 12 divisors (see below), whose sum is σ = 226780680. Its totient is φ = 58314960.

The previous prime is 123109421. The next prime is 123109439. The reversal of 123109436 is 634901321.

It is a junction number, because it is equal to n+sod(n) for n = 123109399 and 123109408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123109439) 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, 809855 + ... + 810006.

It is an arithmetic number, because the mean of its divisors is an integer number (18898390).

Almost surely, 2^123109436 is an apocalyptic number.

It is an amenable number.

123109436 is a deficient number, since it is larger than the sum of its proper divisors (103671244).

123109436 is a wasteful number, since it uses less digits than its factorization.

123109436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619884 (or 1619882 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 123109436 is about 11095.4691653846. The cubic root of 123109436 is about 497.4664317477.

The spelling of 123109436 in words is "one hundred twenty-three million, one hundred nine thousand, four hundred thirty-six".