405942 has 16 divisors (see below), whose sum is σ = 840240. Its totient is φ = 130592.

The previous prime is 405917. The next prime is 405947. The reversal of 405942 is 249504.

It is a d-powerful number, because it can be written as 4⁸ + 0 + 9 + 5⁷ + 4⁹ + 2⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405947) 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, 993 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (52515).

2⁴⁰⁵⁹⁴² is an apocalyptic number.

405942 is an abundant number, since it is smaller than the sum of its proper divisors (434298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405942 is a wasteful number, since it uses less digits than its factorization.

405942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 405942 is about 637.1357783079. The cubic root of 405942 is about 74.0436800799.

The spelling of 405942 in words is "four hundred five thousand, nine hundred forty-two".