4778509 has 4 divisors (see below), whose sum is σ = 4895100. Its totient is φ = 4661920.

The previous prime is 4778491. The next prime is 4778539. The reversal of 4778509 is 9058774.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9058774 = 2 ⋅4529387.

It can be written as a sum of positive squares in 2 ways, for example, as 956484 + 3822025 = 978^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 4778509 - 2⁷ = 4778381 is a prime.

It is a Duffinian number.

4778509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4778539) 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, 58234 + ... + 58315.

It is an arithmetic number, because the mean of its divisors is an integer number (1223775).

Almost surely, 2^4778509 is an apocalyptic number.

It is an amenable number.

4778509 is a deficient number, since it is larger than the sum of its proper divisors (116591).

4778509 is a wasteful number, since it uses less digits than its factorization.

4778509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116590.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 4778509 is about 2185.9801005499. The cubic root of 4778509 is about 168.4344034630.

The spelling of 4778509 in words is "four million, seven hundred seventy-eight thousand, five hundred nine".