123280638 has 16 divisors (see below), whose sum is σ = 265527696. Its totient is φ = 37932480.

The previous prime is 123280631. The next prime is 123280643. The reversal of 123280638 is 836082321.

It is a junction number, because it is equal to n+sod(n) for n = 123280599 and 123280608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123280631) 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 7 ways as a sum of consecutive naturals, for example, 790183 + ... + 790338.

It is an arithmetic number, because the mean of its divisors is an integer number (16595481).

Almost surely, 2^123280638 is an apocalyptic number.

123280638 is an abundant number, since it is smaller than the sum of its proper divisors (142247058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123280638 is a wasteful number, since it uses less digits than its factorization.

123280638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580539.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 123280638 is about 11103.1814359669. The cubic root of 123280638 is about 497.6969253151.

The spelling of 123280638 in words is "one hundred twenty-three million, two hundred eighty thousand, six hundred thirty-eight".