23724137 has 4 divisors (see below), whose sum is σ = 23734740. Its totient is φ = 23713536.

The previous prime is 23724133. The next prime is 23724167. The reversal of 23724137 is 73142732.

23724137 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8271376 + 15452761 = 2876^2 + 3931^2 .

It is a cyclic number.

It is not a de Polignac number, because 23724137 - 2² = 23724133 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23724131) 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, 488 + ... + 6905.

It is an arithmetic number, because the mean of its divisors is an integer number (5933685).

Almost surely, 2^23724137 is an apocalyptic number.

It is an amenable number.

23724137 is a deficient number, since it is larger than the sum of its proper divisors (10603).

23724137 is an equidigital number, since it uses as much as digits as its factorization.

23724137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10602.

The product of its digits is 7056, while the sum is 29.

The square root of 23724137 is about 4870.7429618078. The cubic root of 23724137 is about 287.3404765939.

Adding to 23724137 its reverse (73142732), we get a palindrome (96866869).

The spelling of 23724137 in words is "twenty-three million, seven hundred twenty-four thousand, one hundred thirty-seven".