1556964 has 36 divisors (see below), whose sum is σ = 4005820. Its totient is φ = 509760.

The previous prime is 1556963. The next prime is 1556977. The reversal of 1556964 is 4696551.

It can be written as a sum of positive squares in 2 ways, for example, as 116964 + 1440000 = 342^2 + 1200^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (1556963) 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 11 ways as a sum of consecutive naturals, for example, 1842 + ... + 2550.

2^1556964 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 1556964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2002910).

1556964 is an abundant number, since it is smaller than the sum of its proper divisors (2448856).

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

1556964 is a wasteful number, since it uses less digits than its factorization.

1556964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 775 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 1556964 is about 1247.7836350906. The cubic root of 1556964 is about 115.9025142121.

The spelling of 1556964 in words is "one million, five hundred fifty-six thousand, nine hundred sixty-four".