561407 has 16 divisors (see below), whose sum is σ = 732672. Its totient is φ = 417120.

The previous prime is 561389. The next prime is 561409. The reversal of 561407 is 704165.

It is not a de Polignac number, because 561407 - 2⁶ = 561343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1613 + ... + 1929.

It is an arithmetic number, because the mean of its divisors is an integer number (45792).

2⁵⁶¹⁴⁰⁷ is an apocalyptic number.

561407 is a deficient number, since it is larger than the sum of its proper divisors (171265).

561407 is a wasteful number, since it uses less digits than its factorization.

561407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 561407 is about 749.2709790189. The cubic root of 561407 is about 82.4946797916.

The spelling of 561407 in words is "five hundred sixty-one thousand, four hundred seven".