23039781 has 4 divisors (see below), whose sum is σ = 30719712. Its totient is φ = 15359852.

The previous prime is 23039771. The next prime is 23039843. The reversal of 23039781 is 18793032.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23039781 - 2¹¹ = 23037733 is a prime.

It is a super-2 number, since 2×23039781² = 1061663017055922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23039771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3839961 + ... + 3839966.

It is an arithmetic number, because the mean of its divisors is an integer number (7679928).

Almost surely, 2^23039781 is an apocalyptic number.

It is an amenable number.

23039781 is a deficient number, since it is larger than the sum of its proper divisors (7679931).

23039781 is an equidigital number, since it uses as much as digits as its factorization.

23039781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7679930.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 23039781 is about 4799.9771874458. The cubic root of 23039781 is about 284.5505627827.

The spelling of 23039781 in words is "twenty-three million, thirty-nine thousand, seven hundred eighty-one".