23778197 has 2 divisors, whose sum is σ = 23778198. Its totient is φ = 23778196.

The previous prime is 23778191. The next prime is 23778199. The reversal of 23778197 is 79187732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14205361 + 9572836 = 3769^2 + 3094^2 .

It is a cyclic number.

It is not a de Polignac number, because 23778197 - 2⁶ = 23778133 is a prime.

Together with 23778199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23778191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11889098 + 11889099.

It is an arithmetic number, because the mean of its divisors is an integer number (11889099).

Almost surely, 2^23778197 is an apocalyptic number.

It is an amenable number.

23778197 is a deficient number, since it is larger than the sum of its proper divisors (1).

23778197 is an equidigital number, since it uses as much as digits as its factorization.

23778197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 44.

The square root of 23778197 is about 4876.2892654148. The cubic root of 23778197 is about 287.5585645030.

The spelling of 23778197 in words is "twenty-three million, seven hundred seventy-eight thousand, one hundred ninety-seven".