23894921 has 2 divisors, whose sum is σ = 23894922. Its totient is φ = 23894920.

The previous prime is 23894917. The next prime is 23894957. The reversal of 23894921 is 12949832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22934521 + 960400 = 4789^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 23894921 - 2² = 23894917 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23890921) 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 as a sum of consecutive naturals, namely, 11947460 + 11947461.

It is an arithmetic number, because the mean of its divisors is an integer number (11947461).

Almost surely, 2^23894921 is an apocalyptic number.

It is an amenable number.

23894921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23894921 is an equidigital number, since it uses as much as digits as its factorization.

23894921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 23894921 is about 4888.2431404340. The cubic root of 23894921 is about 288.0283255641.

It can be divided in two parts, 238 and 94921, that added together give a palindrome (95159).

The spelling of 23894921 in words is "twenty-three million, eight hundred ninety-four thousand, nine hundred twenty-one".