23921897 has 4 divisors (see below), whose sum is σ = 24746820. Its totient is φ = 23096976.

The previous prime is 23921861. The next prime is 23921899. The reversal of 23921897 is 79812932.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 11397376 = 3539^2 + 3376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23921897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23921899) 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, 412418 + ... + 412475.

It is an arithmetic number, because the mean of its divisors is an integer number (6186705).

Almost surely, 2^23921897 is an apocalyptic number.

It is an amenable number.

23921897 is a deficient number, since it is larger than the sum of its proper divisors (824923).

23921897 is an equidigital number, since it uses as much as digits as its factorization.

23921897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824922.

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

The square root of 23921897 is about 4891.0016356571. The cubic root of 23921897 is about 288.1366739733.

The spelling of 23921897 in words is "twenty-three million, nine hundred twenty-one thousand, eight hundred ninety-seven".