405983 has 4 divisors (see below), whose sum is σ = 408408. Its totient is φ = 403560.

The previous prime is 405967. The next prime is 405989. The reversal of 405983 is 389504.

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 405983 - 2⁴ = 405967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941 + ... + 1302.

It is an arithmetic number, because the mean of its divisors is an integer number (102102).

2⁴⁰⁵⁹⁸³ is an apocalyptic number.

405983 is a deficient number, since it is larger than the sum of its proper divisors (2425).

405983 is a wasteful number, since it uses less digits than its factorization.

405983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 405983 is about 637.1679527409. The cubic root of 405983 is about 74.0461727912.

The spelling of 405983 in words is "four hundred five thousand, nine hundred eighty-three".