23778409 has 2 divisors, whose sum is σ = 23778410. Its totient is φ = 23778408.

The previous prime is 23778407. The next prime is 23778431. The reversal of 23778409 is 90487732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23736384 + 42025 = 4872^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 23778409 - 2¹ = 23778407 is a prime.

It is a super-3 number, since 3×23778409³ (a number of 23 digits) contains 333 as substring.

Together with 23778407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23778407) 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, 11889204 + 11889205.

It is an arithmetic number, because the mean of its divisors is an integer number (11889205).

Almost surely, 2^23778409 is an apocalyptic number.

It is an amenable number.

23778409 is a deficient number, since it is larger than the sum of its proper divisors (1).

23778409 is an equidigital number, since it uses as much as digits as its factorization.

23778409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 23778409 is about 4876.3110032072. The cubic root of 23778409 is about 287.5594190987.

The spelling of 23778409 in words is "twenty-three million, seven hundred seventy-eight thousand, four hundred nine".