23989549 has 4 divisors (see below), whose sum is σ = 24442236. Its totient is φ = 23536864.

The previous prime is 23989547. The next prime is 23989591. The reversal of 23989549 is 94598932.

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 20187049 + 3802500 = 4493^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 23989549 - 2¹ = 23989547 is a prime.

It is a super-2 number, since 2×23989549² = 1150996922446802, 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 (23989541) 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 3 ways as a sum of consecutive naturals, for example, 226264 + ... + 226369.

It is an arithmetic number, because the mean of its divisors is an integer number (6110559).

Almost surely, 2^23989549 is an apocalyptic number.

It is an amenable number.

23989549 is a deficient number, since it is larger than the sum of its proper divisors (452687).

23989549 is an equidigital number, since it uses as much as digits as its factorization.

23989549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452686.

The product of its digits is 699840, while the sum is 49.

The square root of 23989549 is about 4897.9127186997. The cubic root of 23989549 is about 288.4080386763.

The spelling of 23989549 in words is "twenty-three million, nine hundred eighty-nine thousand, five hundred forty-nine".