1321680 has 40 divisors (see below), whose sum is σ = 4097952. Its totient is φ = 352384.

The previous prime is 1321679. The next prime is 1321681. The reversal of 1321680 is 861231.

It is an interprime number because it is at equal distance from previous prime (1321679) and next prime (1321681).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321681) 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, 2514 + ... + 2993.

2^1321680 is an apocalyptic number.

1321680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321680 is an abundant number, since it is smaller than the sum of its proper divisors (2776272).

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

1321680 is a wasteful number, since it uses less digits than its factorization.

1321680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523 (or 5517 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1321680 is about 1149.6434229795. The cubic root of 1321680 is about 109.7426490719.

The spelling of 1321680 in words is "one million, three hundred twenty-one thousand, six hundred eighty".