23890529 has 4 divisors (see below), whose sum is σ = 25728276. Its totient is φ = 22052784.

The previous prime is 23890513. The next prime is 23890549. The reversal of 23890529 is 92509832.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4950625 + 18939904 = 2225^2 + 4352^2 .

It is not a de Polignac number, because 23890529 - 2⁴ = 23890513 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23890492 and 23890501.

It is not an unprimeable number, because it can be changed into a prime (23890549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918854 + ... + 918879.

It is an arithmetic number, because the mean of its divisors is an integer number (6432069).

Almost surely, 2^23890529 is an apocalyptic number.

It is an amenable number.

23890529 is a deficient number, since it is larger than the sum of its proper divisors (1837747).

23890529 is a wasteful number, since it uses less digits than its factorization.

23890529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837746.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 23890529 is about 4887.7938786328. The cubic root of 23890529 is about 288.0106774912.

The spelling of 23890529 in words is "twenty-three million, eight hundred ninety thousand, five hundred twenty-nine".