123139816 has 8 divisors (see below), whose sum is σ = 230887170. Its totient is φ = 61569904.

The previous prime is 123139813. The next prime is 123139853. The reversal of 123139816 is 618931321.

It can be written as a sum of positive squares in only one way, i.e., 105884100 + 17255716 = 10290^2 + 4154^2 .

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 (123139813) 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 as a sum of consecutive naturals, namely, 7696231 + ... + 7696246.

Almost surely, 2^123139816 is an apocalyptic number.

It is an amenable number.

123139816 is a deficient number, since it is larger than the sum of its proper divisors (107747354).

123139816 is a wasteful number, since it uses less digits than its factorization.

123139816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15392483 (or 15392479 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 123139816 is about 11096.8381082180. The cubic root of 123139816 is about 497.5073486958.

The spelling of 123139816 in words is "one hundred twenty-three million, one hundred thirty-nine thousand, eight hundred sixteen".