123540859 has 12 divisors (see below), whose sum is σ = 138096192. Its totient is φ = 110354400.

The previous prime is 123540829. The next prime is 123540881. The reversal of 123540859 is 958045321.

It is not a de Polignac number, because 123540859 - 2⁷ = 123540731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123540829) 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 11 ways as a sum of consecutive naturals, for example, 6552 + ... + 17029.

It is an arithmetic number, because the mean of its divisors is an integer number (11508016).

Almost surely, 2^123540859 is an apocalyptic number.

123540859 is a deficient number, since it is larger than the sum of its proper divisors (14555333).

123540859 is a wasteful number, since it uses less digits than its factorization.

123540859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23638 (or 23625 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 123540859 is about 11114.8935667419. The cubic root of 123540859 is about 498.0468590821.

The spelling of 123540859 in words is "one hundred twenty-three million, five hundred forty thousand, eight hundred fifty-nine".