1399566 has 32 divisors (see below), whose sum is σ = 3271680. Its totient is φ = 390816.

The previous prime is 1399553. The next prime is 1399577. The reversal of 1399566 is 6659931.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1620 + ... + 2328.

It is an arithmetic number, because the mean of its divisors is an integer number (102240).

2^1399566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1635840).

1399566 is an abundant number, since it is smaller than the sum of its proper divisors (1872114).

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

1399566 is a wasteful number, since it uses less digits than its factorization.

1399566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768.

The product of its digits is 43740, while the sum is 39.

The square root of 1399566 is about 1183.0325439311. The cubic root of 1399566 is about 111.8573332277.

The spelling of 1399566 in words is "one million, three hundred ninety-nine thousand, five hundred sixty-six".