408381 has 8 divisors (see below), whose sum is σ = 548064. Its totient is φ = 270480.

The previous prime is 408379. The next prime is 408389. The reversal of 408381 is 183804.

408381 = 209² + 210² + ... + 217².

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

It is not a de Polignac number, because 408381 - 2¹ = 408379 is a prime.

It is a super-2 number, since 2×408381² = 333550082322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408389) 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, 246 + ... + 936.

It is an arithmetic number, because the mean of its divisors is an integer number (68508).

2⁴⁰⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

408381 is a deficient number, since it is larger than the sum of its proper divisors (139683).

408381 is a wasteful number, since it uses less digits than its factorization.

408381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 408381 is about 639.0469466322. The cubic root of 408381 is about 74.1916749959.

The spelling of 408381 in words is "four hundred eight thousand, three hundred eighty-one".