401609 has 4 divisors (see below), whose sum is σ = 432516. Its totient is φ = 370704.

The previous prime is 401593. The next prime is 401627. The reversal of 401609 is 906104.

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 102400 + 299209 = 320^2 + 547^2 .

It is a cyclic number.

It is not a de Polignac number, because 401609 - 2⁴ = 401593 is a prime.

It is a super-2 number, since 2×401609² = 322579577762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15434 + ... + 15459.

It is an arithmetic number, because the mean of its divisors is an integer number (108129).

2⁴⁰¹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

401609 is a deficient number, since it is larger than the sum of its proper divisors (30907).

401609 is a wasteful number, since it uses less digits than its factorization.

401609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30906.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 401609 is about 633.7262816074. The cubic root of 401609 is about 73.7792912472.

The spelling of 401609 in words is "four hundred one thousand, six hundred nine".