1391680 has 28 divisors (see below), whose sum is σ = 3314700. Its totient is φ = 556544.

The previous prime is 1391669. The next prime is 1391701. The reversal of 1391680 is 861931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 207936 + 1183744 = 456^2 + 1088^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1855 + ... + 2494.

2^1391680 is an apocalyptic number.

1391680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1391680 is an abundant number, since it is smaller than the sum of its proper divisors (1923020).

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

1391680 is an equidigital number, since it uses as much as digits as its factorization.

1391680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366 (or 4356 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1391680 is about 1179.6948758048. The cubic root of 1391680 is about 111.6468468078.

The spelling of 1391680 in words is "one million, three hundred ninety-one thousand, six hundred eighty".