11778409 has 2 divisors, whose sum is σ = 11778410. Its totient is φ = 11778408.

The previous prime is 11778391. The next prime is 11778413. The reversal of 11778409 is 90487711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11751184 + 27225 = 3428^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 11778409 - 2¹¹ = 11776361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11778479) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5889204 + 5889205.

It is an arithmetic number, because the mean of its divisors is an integer number (5889205).

Almost surely, 2^11778409 is an apocalyptic number.

It is an amenable number.

11778409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11778409 is an equidigital number, since it uses as much as digits as its factorization.

11778409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 11778409 is about 3431.9686770132. The cubic root of 11778409 is about 227.5248710884.

The spelling of 11778409 in words is "eleven million, seven hundred seventy-eight thousand, four hundred nine".