23666437 has 2 divisors, whose sum is σ = 23666438. Its totient is φ = 23666436.

The previous prime is 23666411. The next prime is 23666443. The reversal of 23666437 is 73466632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20738916 + 2927521 = 4554^2 + 1711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23666437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23666396 and 23666405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23606437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11833218 + 11833219.

It is an arithmetic number, because the mean of its divisors is an integer number (11833219).

Almost surely, 2^23666437 is an apocalyptic number.

It is an amenable number.

23666437 is a deficient number, since it is larger than the sum of its proper divisors (1).

23666437 is an equidigital number, since it uses as much as digits as its factorization.

23666437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 37.

The square root of 23666437 is about 4864.8162349672. The cubic root of 23666437 is about 287.1073384352.

The spelling of 23666437 in words is "twenty-three million, six hundred sixty-six thousand, four hundred thirty-seven".