11878521 has 4 divisors (see below), whose sum is σ = 15838032. Its totient is φ = 7919012.

The previous prime is 11878507. The next prime is 11878577. The reversal of 11878521 is 12587811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12587811 = 3 ⋅4195937.

It is a cyclic number.

It is not a de Polignac number, because 11878521 - 2⁶ = 11878457 is a prime.

It is a super-2 number, since 2×11878521² = 282198522294882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11878501) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1979751 + ... + 1979756.

It is an arithmetic number, because the mean of its divisors is an integer number (3959508).

Almost surely, 2^11878521 is an apocalyptic number.

It is an amenable number.

11878521 is a deficient number, since it is larger than the sum of its proper divisors (3959511).

11878521 is an equidigital number, since it uses as much as digits as its factorization.

11878521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959510.

The product of its digits is 4480, while the sum is 33.

The square root of 11878521 is about 3446.5230305338. The cubic root of 11878521 is about 228.1676782852.

The spelling of 11878521 in words is "eleven million, eight hundred seventy-eight thousand, five hundred twenty-one".