11878989 has 4 divisors (see below), whose sum is σ = 15838656. Its totient is φ = 7919324.

The previous prime is 11878973. The next prime is 11878991. The reversal of 11878989 is 98987811.

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 11878989 - 2⁴ = 11878973 is a prime.

It is a super-2 number, since 2×11878989² = 282220759324242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11878289) 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, 1979829 + ... + 1979834.

It is an arithmetic number, because the mean of its divisors is an integer number (3959664).

Almost surely, 2^11878989 is an apocalyptic number.

It is an amenable number.

11878989 is a deficient number, since it is larger than the sum of its proper divisors (3959667).

11878989 is an equidigital number, since it uses as much as digits as its factorization.

11878989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959666.

The product of its digits is 290304, while the sum is 51.

The square root of 11878989 is about 3446.5909243773. The cubic root of 11878989 is about 228.1706747601.

The spelling of 11878989 in words is "eleven million, eight hundred seventy-eight thousand, nine hundred eighty-nine".