123408872 has 8 divisors (see below), whose sum is σ = 231391650. Its totient is φ = 61704432.

The previous prime is 123408871. The next prime is 123408907. The reversal of 123408872 is 278804321.

It can be written as a sum of positive squares in only one way, i.e., 120868036 + 2540836 = 10994^2 + 1594^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (123408871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7713047 + ... + 7713062.

Almost surely, 2^123408872 is an apocalyptic number.

It is an amenable number.

123408872 is a deficient number, since it is larger than the sum of its proper divisors (107982778).

123408872 is a wasteful number, since it uses less digits than its factorization.

123408872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15426115 (or 15426111 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 123408872 is about 11108.9545862786. The cubic root of 123408872 is about 497.8694302401.

It can be divided in two parts, 12340 and 8872, that added together give a palindrome (21212).

The spelling of 123408872 in words is "one hundred twenty-three million, four hundred eight thousand, eight hundred seventy-two".