123728049 has 6 divisors (see below), whose sum is σ = 178718306. Its totient is φ = 82485360.

The previous prime is 123728047. The next prime is 123728053. The reversal of 123728049 is 940827321.

It can be written as a sum of positive squares in only one way, i.e., 93257649 + 30470400 = 9657^2 + 5520^2 .

It is not a de Polignac number, because 123728049 - 2¹ = 123728047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123728047) 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 5 ways as a sum of consecutive naturals, for example, 6873772 + ... + 6873789.

Almost surely, 2^123728049 is an apocalyptic number.

It is an amenable number.

123728049 is a deficient number, since it is larger than the sum of its proper divisors (54990257).

123728049 is a wasteful number, since it uses less digits than its factorization.

123728049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13747567 (or 13747564 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 123728049 is about 11123.3110628086. The cubic root of 123728049 is about 498.2982802034.

The spelling of 123728049 in words is "one hundred twenty-three million, seven hundred twenty-eight thousand, forty-nine".