1399805 has 16 divisors (see below), whose sum is σ = 1893888. Its totient is φ = 984000.

The previous prime is 1399793. The next prime is 1399813. The reversal of 1399805 is 5089931.

It is not a de Polignac number, because 1399805 - 2⁴ = 1399789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1295 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (118368).

2^1399805 is an apocalyptic number.

It is an amenable number.

1399805 is a deficient number, since it is larger than the sum of its proper divisors (494083).

1399805 is a wasteful number, since it uses less digits than its factorization.

1399805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1399805 is about 1183.1335512105. The cubic root of 1399805 is about 111.8637000540.

The spelling of 1399805 in words is "one million, three hundred ninety-nine thousand, eight hundred five".