1561724 has 12 divisors (see below), whose sum is σ = 2877000. Its totient is φ = 739728.

The previous prime is 1561711. The next prime is 1561727. The reversal of 1561724 is 4271651.

It is a junction number, because it is equal to n+sod(n) for n = 1561693 and 1561702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10199 + ... + 10350.

It is an arithmetic number, because the mean of its divisors is an integer number (239750).

2^1561724 is an apocalyptic number.

It is an amenable number.

1561724 is a deficient number, since it is larger than the sum of its proper divisors (1315276).

1561724 is a wasteful number, since it uses less digits than its factorization.

1561724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20572 (or 20570 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 1561724 is about 1249.6895614512. The cubic root of 1561724 is about 116.0205076703.

The spelling of 1561724 in words is "one million, five hundred sixty-one thousand, seven hundred twenty-four".