1399808 has 22 divisors (see below), whose sum is σ = 2800296. Its totient is φ = 699392.

The previous prime is 1399793. The next prime is 1399813. The reversal of 1399808 is 8089931.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 341 + ... + 1707.

2^1399808 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 1399808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1400148).

1399808 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1399808 is an equidigital number, since it uses as much as digits as its factorization.

1399808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387 (or 1369 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1399808 is about 1183.1348190295. The cubic root of 1399808 is about 111.8637799677.

The spelling of 1399808 in words is "one million, three hundred ninety-nine thousand, eight hundred eight".