123540745 has 4 divisors (see below), whose sum is σ = 148248900. Its totient is φ = 98832592.

The previous prime is 123540733. The next prime is 123540757. The reversal of 123540745 is 547045321.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (123540733) and next prime (123540757).

It can be written as a sum of positive squares in 2 ways, for example, as 77951241 + 45589504 = 8829^2 + 6752^2 .

It is a cyclic number.

It is not a de Polignac number, because 123540745 - 2⁷ = 123540617 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12354070 + ... + 12354079.

It is an arithmetic number, because the mean of its divisors is an integer number (37062225).

Almost surely, 2^123540745 is an apocalyptic number.

It is an amenable number.

123540745 is a deficient number, since it is larger than the sum of its proper divisors (24708155).

123540745 is an equidigital number, since it uses as much as digits as its factorization.

123540745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24708154.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 123540745 is about 11114.8884384865. Note that the first 3 decimals coincide. The cubic root of 123540745 is about 498.0467058876.

The spelling of 123540745 in words is "one hundred twenty-three million, five hundred forty thousand, seven hundred forty-five".