1561896 has 64 divisors (see below), whose sum is σ = 4963200. Its totient is φ = 445824.

The previous prime is 1561891. The next prime is 1561919. The reversal of 1561896 is 6981651.

1561896 is a `hidden beast` number, since 1 + 561 + 8 + 96 = 666.

It is a super-2 number, since 2×1561896² = 4879038229632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1561896.

It is not an unprimeable number, because it can be changed into a prime (1561891) 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, 996 + ... + 2028.

It is an arithmetic number, because the mean of its divisors is an integer number (77550).

2^1561896 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 1561896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2481600).

1561896 is an abundant number, since it is smaller than the sum of its proper divisors (3401304).

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

1561896 is a wasteful number, since it uses less digits than its factorization.

1561896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055 (or 1045 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1561896 is about 1249.7583766473. The cubic root of 1561896 is about 116.0247668084.

The spelling of 1561896 in words is "one million, five hundred sixty-one thousand, eight hundred ninety-six".