403409 has 4 divisors (see below), whose sum is σ = 407220. Its totient is φ = 399600.

The previous prime is 403391. The next prime is 403433. The reversal of 403409 is 904304.

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 222784 + 180625 = 472^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 403409 - 2¹⁶ = 337873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403439) 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, 1742 + ... + 1959.

It is an arithmetic number, because the mean of its divisors is an integer number (101805).

2⁴⁰³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

403409 is a deficient number, since it is larger than the sum of its proper divisors (3811).

403409 is a wasteful number, since it uses less digits than its factorization.

403409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 403409 is about 635.1448653654. The cubic root of 403409 is about 73.8893525347.

The spelling of 403409 in words is "four hundred three thousand, four hundred nine".