408931 has 4 divisors (see below), whose sum is σ = 411264. Its totient is φ = 406600.

The previous prime is 408923. The next prime is 408943. The reversal of 408931 is 139804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 408931 - 2³ = 408923 is a prime.

It is a super-2 number, since 2×408931² = 334449125522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 408896 and 408905.

It is not an unprimeable number, because it can be changed into a prime (408911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880 + ... + 1261.

It is an arithmetic number, because the mean of its divisors is an integer number (102816).

2⁴⁰⁸⁹³¹ is an apocalyptic number.

408931 is a deficient number, since it is larger than the sum of its proper divisors (2333).

408931 is a wasteful number, since it uses less digits than its factorization.

408931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 408931 is about 639.4771301618. The cubic root of 408931 is about 74.2249667147.

The spelling of 408931 in words is "four hundred eight thousand, nine hundred thirty-one".