1608409 has 8 divisors (see below), whose sum is σ = 1779552. Its totient is φ = 1441440.

The previous prime is 1608401. The next prime is 1608433. The reversal of 1608409 is 9048061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1608409 - 2³ = 1608401 is a prime.

It is a super-2 number, since 2×1608409² = 5173959022562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1608401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199 + ... + 1804.

It is an arithmetic number, because the mean of its divisors is an integer number (222444).

2^1608409 is an apocalyptic number.

It is an amenable number.

1608409 is a deficient number, since it is larger than the sum of its proper divisors (171143).

1608409 is a wasteful number, since it uses less digits than its factorization.

1608409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1608409 is about 1268.2306572544. The cubic root of 1608409 is about 117.1652521558.

The spelling of 1608409 in words is "one million, six hundred eight thousand, four hundred nine".