123267139828 has 24 divisors (see below), whose sum is σ = 247557257024. Its totient is φ = 52609564800.

The previous prime is 123267139771. The next prime is 123267139837. The reversal of 123267139828 is 828931762321.

It is a happy number.

It is a super-2 number, since 2×123267139828² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9126858 + ... + 9140353.

Almost surely, 2^123267139828 is an apocalyptic number.

It is an amenable number.

123267139828 is an abundant number, since it is smaller than the sum of its proper divisors (124290117196).

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

123267139828 is a wasteful number, since it uses less digits than its factorization.

123267139828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18267463 (or 18267461 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 52.

The spelling of 123267139828 in words is "one hundred twenty-three billion, two hundred sixty-seven million, one hundred thirty-nine thousand, eight hundred twenty-eight".