8478457 has 4 divisors (see below), whose sum is σ = 9130660. Its totient is φ = 7826256.

The previous prime is 8478433. The next prime is 8478493. The reversal of 8478457 is 7548748.

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 4414201 + 4064256 = 2101^2 + 2016^2 .

It is a cyclic number.

It is not a de Polignac number, because 8478457 - 2²³ = 89849 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8478497) 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, 326082 + ... + 326107.

It is an arithmetic number, because the mean of its divisors is an integer number (2282665).

Almost surely, 2^8478457 is an apocalyptic number.

It is an amenable number.

8478457 is a deficient number, since it is larger than the sum of its proper divisors (652203).

8478457 is a wasteful number, since it uses less digits than its factorization.

8478457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652202.

The product of its digits is 250880, while the sum is 43.

The square root of 8478457 is about 2911.7790094717. The cubic root of 8478457 is about 203.9101953176.

The spelling of 8478457 in words is "eight million, four hundred seventy-eight thousand, four hundred fifty-seven".