408561 has 8 divisors (see below), whose sum is σ = 576864. Its totient is φ = 256320.

The previous prime is 408553. The next prime is 408563. The reversal of 408561 is 165804.

408561 = T₂₀₄ + T₂₀₅ + ... + T₂₂₁.

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

It is not a de Polignac number, because 408561 - 2³ = 408553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (408563) 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, 3955 + ... + 4056.

It is an arithmetic number, because the mean of its divisors is an integer number (72108).

2⁴⁰⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

408561 is a deficient number, since it is larger than the sum of its proper divisors (168303).

408561 is a wasteful number, since it uses less digits than its factorization.

408561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8031.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 408561 is about 639.1877658404. The cubic root of 408561 is about 74.2025737562.

It can be divided in two parts, 408 and 561, that added together give a palindrome (969).

The spelling of 408561 in words is "four hundred eight thousand, five hundred sixty-one".