123402909928 has 8 divisors (see below), whose sum is σ = 231380456130. Its totient is φ = 61701454960.

The previous prime is 123402909893. The next prime is 123402909947. The reversal of 123402909928 is 829909204321.

It can be written as a sum of positive squares in only one way, i.e., 67206414564 + 56196495364 = 259242^2 + 237058^2 .

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

It is a super-3 number, since 3×123402909928³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7712681863 + ... + 7712681878.

Almost surely, 2^123402909928 is an apocalyptic number.

It is an amenable number.

123402909928 is a deficient number, since it is larger than the sum of its proper divisors (107977546202).

123402909928 is a wasteful number, since it uses less digits than its factorization.

123402909928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15425363747 (or 15425363743 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 123402909928 in words is "one hundred twenty-three billion, four hundred two million, nine hundred nine thousand, nine hundred twenty-eight".