23897921 has 2 divisors, whose sum is σ = 23897922. Its totient is φ = 23897920.

The previous prime is 23897917. The next prime is 23897927. The reversal of 23897921 is 12979832.

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., 23814400 + 83521 = 4880^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 23897921 - 2² = 23897917 is a prime.

It is a super-2 number, since 2×23897921² = 1142221256244482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23897927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11948960 + 11948961.

It is an arithmetic number, because the mean of its divisors is an integer number (11948961).

Almost surely, 2^23897921 is an apocalyptic number.

It is an amenable number.

23897921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23897921 is an equidigital number, since it uses as much as digits as its factorization.

23897921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 23897921 is about 4888.5499895163. The cubic root of 23897921 is about 288.0403790156.

The spelling of 23897921 in words is "twenty-three million, eight hundred ninety-seven thousand, nine hundred twenty-one".