1391808 has 56 divisors (see below), whose sum is σ = 4023360. Its totient is φ = 421120.

The previous prime is 1391779. The next prime is 1391849. The reversal of 1391808 is 8081931.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1783 + ... + 2441.

2^1391808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2011680).

1391808 is an abundant number, since it is smaller than the sum of its proper divisors (2631552).

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

1391808 is a wasteful number, since it uses less digits than its factorization.

1391808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685 (or 675 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1391808 is about 1179.7491258738. The cubic root of 1391808 is about 111.6502696154.

The spelling of 1391808 in words is "one million, three hundred ninety-one thousand, eight hundred eight".