561402 has 12 divisors (see below), whose sum is σ = 1216410. Its totient is φ = 187128.

The previous prime is 561389. The next prime is 561409. The reversal of 561402 is 204165.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 12321 = 741^2 + 111^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 31189 = 561402 / (5 + 6 + 1 + 4 + 0 + 2).

It is an Ulam number.

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

561402 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15577 + ... + 15612.

2⁵⁶¹⁴⁰² is an apocalyptic number.

561402 is an abundant number, since it is smaller than the sum of its proper divisors (655008).

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

561402 is a wasteful number, since it uses less digits than its factorization.

561402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31197 (or 31194 counting only the distinct ones).

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

The square root of 561402 is about 749.2676424349. The cubic root of 561402 is about 82.4944348863.

Adding to 561402 its reverse (204165), we get a palindrome (765567).

It can be divided in two parts, 561 and 402, that multiplied together give a palindrome (225522).

The spelling of 561402 in words is "five hundred sixty-one thousand, four hundred two".