11881778 has 4 divisors (see below), whose sum is σ = 17822670. Its totient is φ = 5940888.

The previous prime is 11881769. The next prime is 11881781. The reversal of 11881778 is 87718811.

It is a happy number.

11881778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6466849 + 5414929 = 2543^2 + 2327^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2970443 + ... + 2970446.

Almost surely, 2^11881778 is an apocalyptic number.

11881778 is a deficient number, since it is larger than the sum of its proper divisors (5940892).

11881778 is an equidigital number, since it uses as much as digits as its factorization.

11881778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5940891.

The product of its digits is 25088, while the sum is 41.

The square root of 11881778 is about 3446.9955033333. The cubic root of 11881778 is about 228.1885303261.

The spelling of 11881778 in words is "eleven million, eight hundred eighty-one thousand, seven hundred seventy-eight".