478686989 has 4 divisors (see below), whose sum is σ = 522204000. Its totient is φ = 435169980.

The previous prime is 478686977. The next prime is 478686997. The reversal of 478686989 is 989686874.

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 478686989 - 2¹⁶ = 478621453 is a prime.

It is a super-2 number, since 2×478686989² = 458282466875772242, 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 (478686919) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21758489 + ... + 21758510.

It is an arithmetic number, because the mean of its divisors is an integer number (130551000).

Almost surely, 2^478686989 is an apocalyptic number.

It is an amenable number.

478686989 is a deficient number, since it is larger than the sum of its proper divisors (43517011).

478686989 is a wasteful number, since it uses less digits than its factorization.

478686989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43517010.

The product of its digits is 41803776, while the sum is 65.

The square root of 478686989 is about 21878.9165408162. The cubic root of 478686989 is about 782.2589506820.

The spelling of 478686989 in words is "four hundred seventy-eight million, six hundred eighty-six thousand, nine hundred eighty-nine".