11897779 has 2 divisors, whose sum is σ = 11897780. Its totient is φ = 11897778.

The previous prime is 11897777. The next prime is 11897783. The reversal of 11897779 is 97779811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11897779 - 2¹ = 11897777 is a prime.

Together with 11897777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11897771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5948889 + 5948890.

It is an arithmetic number, because the mean of its divisors is an integer number (5948890).

Almost surely, 2^11897779 is an apocalyptic number.

11897779 is a deficient number, since it is larger than the sum of its proper divisors (1).

11897779 is an equidigital number, since it uses as much as digits as its factorization.

11897779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 49.

The square root of 11897779 is about 3449.3157292425. The cubic root of 11897779 is about 228.2909169912.

The spelling of 11897779 in words is "eleven million, eight hundred ninety-seven thousand, seven hundred seventy-nine".