1321656 has 32 divisors (see below), whose sum is σ = 3776640. Its totient is φ = 377568.

The previous prime is 1321651. The next prime is 1321657. The reversal of 1321656 is 6561231.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321651) 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, 3766 + ... + 4101.

It is an arithmetic number, because the mean of its divisors is an integer number (118020).

2^1321656 is an apocalyptic number.

It is an amenable number.

1321656 is an abundant number, since it is smaller than the sum of its proper divisors (2454984).

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

1321656 is a wasteful number, since it uses less digits than its factorization.

1321656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7883 (or 7879 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 1321656 is about 1149.6329849130. The cubic root of 1321656 is about 109.7419848063.

Adding to 1321656 its reverse (6561231), we get a palindrome (7882887).

The spelling of 1321656 in words is "one million, three hundred twenty-one thousand, six hundred fifty-six".