11978489 has 4 divisors (see below), whose sum is σ = 12683124. Its totient is φ = 11273856.

The previous prime is 11978459. The next prime is 11978503. The reversal of 11978489 is 98487911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9560464 + 2418025 = 3092^2 + 1555^2 .

It is not a de Polignac number, because 11978489 - 2⁸ = 11978233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978419) 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, 352292 + ... + 352325.

It is an arithmetic number, because the mean of its divisors is an integer number (3170781).

Almost surely, 2^11978489 is an apocalyptic number.

It is an amenable number.

11978489 is a deficient number, since it is larger than the sum of its proper divisors (704635).

11978489 is an equidigital number, since it uses as much as digits as its factorization.

11978489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704634.

The product of its digits is 145152, while the sum is 47.

The square root of 11978489 is about 3460.9953770556. The cubic root of 11978489 is about 228.8059669760.

The spelling of 11978489 in words is "eleven million, nine hundred seventy-eight thousand, four hundred eighty-nine".