123440836 has 12 divisors (see below), whose sum is σ = 217599228. Its totient is φ = 61269632.

The previous prime is 123440833. The next prime is 123440851. The reversal of 123440836 is 638044321.

123440836 = T₈₃ + T₈₄ + ... + T₉₀₄.

It can be written as a sum of positive squares in 2 ways, for example, as 33570436 + 89870400 = 5794^2 + 9480^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123440798 and 123440807.

It is not an unprimeable number, because it can be changed into a prime (123440833) 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, 112081 + ... + 113176.

It is an arithmetic number, because the mean of its divisors is an integer number (18133269).

Almost surely, 2^123440836 is an apocalyptic number.

It is an amenable number.

123440836 is a deficient number, since it is larger than the sum of its proper divisors (94158392).

123440836 is a wasteful number, since it uses less digits than its factorization.

123440836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225398 (or 225396 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 123440836 is about 11110.3931523596. The cubic root of 123440836 is about 497.9124107392.

The spelling of 123440836 in words is "one hundred twenty-three million, four hundred forty thousand, eight hundred thirty-six".