478649 has 4 divisors (see below), whose sum is σ = 480036. Its totient is φ = 477264.

The previous prime is 478637. The next prime is 478651. The reversal of 478649 is 946874.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 156025 = 568^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 478649 - 2¹⁶ = 413113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478679) 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, 287 + ... + 1019.

It is an arithmetic number, because the mean of its divisors is an integer number (120009).

2⁴⁷⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

478649 is a deficient number, since it is larger than the sum of its proper divisors (1387).

478649 is an equidigital number, since it uses as much as digits as its factorization.

478649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386.

The product of its digits is 48384, while the sum is 38.

The square root of 478649 is about 691.8446357384. The cubic root of 478649 is about 78.2238256560.

The spelling of 478649 in words is "four hundred seventy-eight thousand, six hundred forty-nine".