11878981 has 4 divisors (see below), whose sum is σ = 11896864. Its totient is φ = 11861100.

The previous prime is 11878973. The next prime is 11878991. The reversal of 11878981 is 18987811.

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.

It is a cyclic number.

It is not a de Polignac number, because 11878981 - 2³ = 11878973 is a prime.

It is a super-2 number, since 2×11878981² = 282220379196722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11878991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7905 + ... + 9286.

It is an arithmetic number, because the mean of its divisors is an integer number (2974216).

Almost surely, 2^11878981 is an apocalyptic number.

It is an amenable number.

11878981 is a deficient number, since it is larger than the sum of its proper divisors (17883).

11878981 is an equidigital number, since it uses as much as digits as its factorization.

11878981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17882.

The product of its digits is 32256, while the sum is 43.

The square root of 11878981 is about 3446.5897638100. The cubic root of 11878981 is about 228.1706235390.

The spelling of 11878981 in words is "eleven million, eight hundred seventy-eight thousand, nine hundred eighty-one".