1561344 has 72 divisors (see below), whose sum is σ = 4415040. Its totient is φ = 488448.

The previous prime is 1561337. The next prime is 1561349. The reversal of 1561344 is 4431651.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1561349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14539 + ... + 14645.

It is an arithmetic number, because the mean of its divisors is an integer number (61320).

2^1561344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2207520).

1561344 is an abundant number, since it is smaller than the sum of its proper divisors (2853696).

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

1561344 is a wasteful number, since it uses less digits than its factorization.

1561344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 131 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 1561344 is about 1249.5375144428. The cubic root of 1561344 is about 116.0110968377.

1561344 divided by its sum of digits (24) gives a palindrome (65056).

Adding to 1561344 its reverse (4431651), we get a palindrome (5992995).

The spelling of 1561344 in words is "one million, five hundred sixty-one thousand, three hundred forty-four".