23540145 has 32 divisors (see below), whose sum is σ = 39982080. Its totient is φ = 11793600.

The previous prime is 23540137. The next prime is 23540147. The reversal of 23540145 is 54104532.

It is not a de Polignac number, because 23540145 - 2³ = 23540137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23540147) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 42762 + ... + 43308.

It is an arithmetic number, because the mean of its divisors is an integer number (1249440).

Almost surely, 2^23540145 is an apocalyptic number.

It is an amenable number.

23540145 is a deficient number, since it is larger than the sum of its proper divisors (16441935).

23540145 is a wasteful number, since it uses less digits than its factorization.

23540145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 23540145 is about 4851.8187311564. The cubic root of 23540145 is about 286.5957271433.

Adding to 23540145 its reverse (54104532), we get a palindrome (77644677).

The spelling of 23540145 in words is "twenty-three million, five hundred forty thousand, one hundred forty-five".