1556864 has 16 divisors (see below), whose sum is σ = 3101820. Its totient is φ = 778368.

The previous prime is 1556839. The next prime is 1556869. The reversal of 1556864 is 4686551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5954 + ... + 6209.

2^1556864 is an apocalyptic number.

It is an amenable number.

1556864 is a deficient number, since it is larger than the sum of its proper divisors (1544956).

1556864 is an equidigital number, since it uses as much as digits as its factorization.

1556864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12177 (or 12165 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 1556864 is about 1247.7435633975. The cubic root of 1556864 is about 115.9000327804.

The spelling of 1556864 in words is "one million, five hundred fifty-six thousand, eight hundred sixty-four".