11773978 has 4 divisors (see below), whose sum is σ = 17660970. Its totient is φ = 5886988.

The previous prime is 11773969. The next prime is 11773987. The reversal of 11773978 is 87937711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87937711 = 2417 ⋅36383.

It is an interprime number because it is at equal distance from previous prime (11773969) and next prime (11773987).

It can be written as a sum of positive squares in only one way, i.e., 8450649 + 3323329 = 2907^2 + 1823^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2943493 + ... + 2943496.

Almost surely, 2^11773978 is an apocalyptic number.

11773978 is a deficient number, since it is larger than the sum of its proper divisors (5886992).

11773978 is an equidigital number, since it uses as much as digits as its factorization.

11773978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5886991.

The product of its digits is 74088, while the sum is 43.

The square root of 11773978 is about 3431.3230684388. The cubic root of 11773978 is about 227.4963361323.

The spelling of 11773978 in words is "eleven million, seven hundred seventy-three thousand, nine hundred seventy-eight".