1331760 has 80 divisors (see below), whose sum is σ = 4285440. Its totient is φ = 341760.

The previous prime is 1331749. The next prime is 1331761. The reversal of 1331760 is 671331.

1331760 = T₂₁ + T₂₂ + ... + T₁₉₉.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1331761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7351 + ... + 7529.

It is an arithmetic number, because the mean of its divisors is an integer number (53568).

2^1331760 is an apocalyptic number.

1331760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2142720).

1331760 is an abundant number, since it is smaller than the sum of its proper divisors (2953680).

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

1331760 is a wasteful number, since it uses less digits than its factorization.

1331760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 1331760 is about 1154.0190639673. The cubic root of 1331760 is about 110.0209326554.

The spelling of 1331760 in words is "one million, three hundred thirty-one thousand, seven hundred sixty".