408644 has 6 divisors (see below), whose sum is σ = 715134. Its totient is φ = 204320.

The previous prime is 408643. The next prime is 408659. The reversal of 408644 is 446804.

It can be written as a sum of positive squares in only one way, i.e., 407044 + 1600 = 638^2 + 40^2 .

It is not an unprimeable number, because it can be changed into a prime (408643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51077 + ... + 51084.

It is an arithmetic number, because the mean of its divisors is an integer number (119189).

2⁴⁰⁸⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

408644 is a deficient number, since it is larger than the sum of its proper divisors (306490).

408644 is a wasteful number, since it uses less digits than its factorization.

408644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102165 (or 102163 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 408644 is about 639.2526886920. The cubic root of 408644 is about 74.2075982174.

The spelling of 408644 in words is "four hundred eight thousand, six hundred forty-four".