403609 has 4 divisors (see below), whose sum is σ = 406116. Its totient is φ = 401104.

The previous prime is 403607. The next prime is 403621. The reversal of 403609 is 906304.

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 265225 + 138384 = 515^2 + 372^2 .

It is a cyclic number.

It is not a de Polignac number, because 403609 - 2¹ = 403607 is a prime.

It is a Smith number, since the sum of its digits (22) 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.

It is a self number, because there is not a number n which added to its sum of digits gives 403609.

It is not an unprimeable number, because it can be changed into a prime (403603) 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, 994 + ... + 1339.

It is an arithmetic number, because the mean of its divisors is an integer number (101529).

2⁴⁰³⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

403609 is a deficient number, since it is larger than the sum of its proper divisors (2507).

403609 is a wasteful number, since it uses less digits than its factorization.

403609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 403609 is about 635.3022902524. The cubic root of 403609 is about 73.9015613426.

The spelling of 403609 in words is "four hundred three thousand, six hundred nine".