11978545 has 8 divisors (see below), whose sum is σ = 14449896. Its totient is φ = 9532416.

The previous prime is 11978539. The next prime is 11978567. The reversal of 11978545 is 54587911.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 82944 + 11895601 = 288^2 + 3449^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11978545 - 2⁹ = 11978033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11978498 and 11978507.

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 7 ways as a sum of consecutive naturals, for example, 5242 + ... + 7171.

It is an arithmetic number, because the mean of its divisors is an integer number (1806237).

Almost surely, 2^11978545 is an apocalyptic number.

It is an amenable number.

11978545 is a deficient number, since it is larger than the sum of its proper divisors (2471351).

11978545 is a wasteful number, since it uses less digits than its factorization.

11978545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12611.

The product of its digits is 50400, while the sum is 40.

The square root of 11978545 is about 3461.0034672043. The cubic root of 11978545 is about 228.8063235350.

The spelling of 11978545 in words is "eleven million, nine hundred seventy-eight thousand, five hundred forty-five".