561420 has 36 divisors (see below), whose sum is σ = 1703520. Its totient is φ = 149664.

The previous prime is 561419. The next prime is 561439. The reversal of 561420 is 24165.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 561393 and 561402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1380 + ... + 1739.

It is an arithmetic number, because the mean of its divisors is an integer number (47320).

2⁵⁶¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

561420 is an abundant number, since it is smaller than the sum of its proper divisors (1142100).

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

561420 is a wasteful number, since it uses less digits than its factorization.

561420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134 (or 3129 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 561420 is about 749.2796540678. The cubic root of 561420 is about 82.4953165385.

Adding to 561420 its reverse (24165), we get a palindrome (585585).

It can be divided in two parts, 5 and 61420, that added together give a triangular number (61425 = T₃₅₀).

The spelling of 561420 in words is "five hundred sixty-one thousand, four hundred twenty".