23729749 has 2 divisors, whose sum is σ = 23729750. Its totient is φ = 23729748.

The previous prime is 23729747. The next prime is 23729779. The reversal of 23729749 is 94792732.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22972849 + 756900 = 4793^2 + 870^2 .

It is a cyclic number.

It is not a de Polignac number, because 23729749 - 2¹ = 23729747 is a prime.

Together with 23729747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23729747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11864874 + 11864875.

It is an arithmetic number, because the mean of its divisors is an integer number (11864875).

Almost surely, 2^23729749 is an apocalyptic number.

It is an amenable number.

23729749 is a deficient number, since it is larger than the sum of its proper divisors (1).

23729749 is an equidigital number, since it uses as much as digits as its factorization.

23729749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 43.

The square root of 23729749 is about 4871.3190205529. The cubic root of 23729749 is about 287.3631318279.

It can be divided in two parts, 2372 and 9749, that added together give a palindrome (12121).

The spelling of 23729749 in words is "twenty-three million, seven hundred twenty-nine thousand, seven hundred forty-nine".