23540309 has 8 divisors (see below), whose sum is σ = 25412352. Its totient is φ = 21677040.

The previous prime is 23540303. The next prime is 23540323. The reversal of 23540309 is 90304532.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23540309 - 2¹² = 23536213 is a prime.

It is a super-2 number, since 2×23540309² = 1108292295630962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23540303) 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 7 ways as a sum of consecutive naturals, for example, 4064 + ... + 7974.

It is an arithmetic number, because the mean of its divisors is an integer number (3176544).

Almost surely, 2^23540309 is an apocalyptic number.

It is an amenable number.

23540309 is a deficient number, since it is larger than the sum of its proper divisors (1872043).

23540309 is a wasteful number, since it uses less digits than its factorization.

23540309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4387.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 23540309 is about 4851.8356320057. The cubic root of 23540309 is about 286.5963926956.

The spelling of 23540309 in words is "twenty-three million, five hundred forty thousand, three hundred nine".