405870 has 32 divisors (see below), whose sum is σ = 991872. Its totient is φ = 106272.

The previous prime is 405869. The next prime is 405871. The reversal of 405870 is 78504.

It is an interprime number because it is at equal distance from previous prime (405869) and next prime (405871).

It is a self number, because there is not a number n which added to its sum of digits gives 405870.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405870.

It is not an unprimeable number, because it can be changed into a prime (405871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2409 + ... + 2571.

It is an arithmetic number, because the mean of its divisors is an integer number (30996).

2⁴⁰⁵⁸⁷⁰ is an apocalyptic number.

405870 is an abundant number, since it is smaller than the sum of its proper divisors (586002).

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

405870 is a wasteful number, since it uses less digits than its factorization.

405870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 405870 is about 637.0792729323. The cubic root of 405870 is about 74.0393022293.

It can be divided in two parts, 405 and 870, that added together give a triangular number (1275 = T₅₀).

The spelling of 405870 in words is "four hundred five thousand, eight hundred seventy".