4094509 has 4 divisors (see below), whose sum is σ = 4112316. Its totient is φ = 4076704.

The previous prime is 4094479. The next prime is 4094513. The reversal of 4094509 is 9054904.

It is a happy number.

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 1814409 + 2280100 = 1347^2 + 1510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4094509 is a prime.

It is a super-3 number, since 3×4094509³ (a number of 21 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

4094509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4094549) 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, 8554 + ... + 9019.

It is an arithmetic number, because the mean of its divisors is an integer number (1028079).

Almost surely, 2^4094509 is an apocalyptic number.

It is an amenable number.

4094509 is a deficient number, since it is larger than the sum of its proper divisors (17807).

4094509 is a wasteful number, since it uses less digits than its factorization.

4094509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17806.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 4094509 is about 2023.4893130432. The cubic root of 4094509 is about 159.9805835814.

It can be divided in two parts, 40 and 94509, that added together give a palindrome (94549).

The spelling of 4094509 in words is "four million, ninety-four thousand, five hundred nine".