123909057 has 12 divisors (see below), whose sum is σ = 179077860. Its totient is φ = 82560768.

The previous prime is 123909029. The next prime is 123909113. The reversal of 123909057 is 750909321.

It can be written as a sum of positive squares in 2 ways, for example, as 102090816 + 21818241 = 10104^2 + 4671^2 .

It is not a de Polignac number, because 123909057 - 2¹¹ = 123907009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123909007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25573 + ... + 30029.

It is an arithmetic number, because the mean of its divisors is an integer number (14923155).

Almost surely, 2^123909057 is an apocalyptic number.

It is an amenable number.

123909057 is a deficient number, since it is larger than the sum of its proper divisors (55168803).

123909057 is a wasteful number, since it uses less digits than its factorization.

123909057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552 (or 7549 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 123909057 is about 11131.4445154257. Note that the first 3 decimals coincide. The cubic root of 123909057 is about 498.5411570274.

The spelling of 123909057 in words is "one hundred twenty-three million, nine hundred nine thousand, fifty-seven".