405988 has 12 divisors (see below), whose sum is σ = 775152. Its totient is φ = 184520.

The previous prime is 405967. The next prime is 405989. The reversal of 405988 is 889504.

It is a super-2 number, since 2×405988² = 329652512288, which contains 22 as substring.

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, 4570 + ... + 4657.

It is an arithmetic number, because the mean of its divisors is an integer number (64596).

2⁴⁰⁵⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

405988 is a deficient number, since it is larger than the sum of its proper divisors (369164).

405988 is a wasteful number, since it uses less digits than its factorization.

405988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9242 (or 9240 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 405988 is about 637.1718763411. The cubic root of 405988 is about 74.0464767689.

The spelling of 405988 in words is "four hundred five thousand, nine hundred eighty-eight".