11978522 has 8 divisors (see below), whose sum is σ = 18017076. Its totient is φ = 5972832.

The previous prime is 11978507. The next prime is 11978539. The reversal of 11978522 is 22587911.

It is a Cunningham number, because it is equal to 3461²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 11978521 + 1 = 3461^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 7283 + ... + 8774.

Almost surely, 2^11978522 is an apocalyptic number.

11978522 is a deficient number, since it is larger than the sum of its proper divisors (6038554).

11978522 is a wasteful number, since it uses less digits than its factorization.

11978522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16432.

The product of its digits is 10080, while the sum is 35.

The square root of 11978522 is about 3461.0001444669. Note that the first 3 decimals coincide. The cubic root of 11978522 is about 228.8061770913.

The spelling of 11978522 in words is "eleven million, nine hundred seventy-eight thousand, five hundred twenty-two".