400590 has 24 divisors (see below), whose sum is σ = 1041768. Its totient is φ = 106800.

The previous prime is 400579. The next prime is 400597. The reversal of 400590 is 95004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2136 + ... + 2315.

It is an arithmetic number, because the mean of its divisors is an integer number (43407).

2⁴⁰⁰⁵⁹⁰ is an apocalyptic number.

400590 is an abundant number, since it is smaller than the sum of its proper divisors (641178).

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

400590 is a wasteful number, since it uses less digits than its factorization.

400590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464 (or 4461 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 400590 is about 632.9217961170. The cubic root of 400590 is about 73.7168384859.

Adding to 400590 its reverse (95004), we get a palindrome (495594).

It can be divided in two parts, 4005 and 90, that added together give a triangular number (4095 = T₉₀).

The spelling of 400590 in words is "four hundred thousand, five hundred ninety".