1399823 has 4 divisors (see below), whose sum is σ = 1405920. Its totient is φ = 1393728.

The previous prime is 1399819. The next prime is 1399837. The reversal of 1399823 is 3289931.

1399823 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1399823 - 2² = 1399819 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399813) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2690 + ... + 3167.

It is an arithmetic number, because the mean of its divisors is an integer number (351480).

2^1399823 is an apocalyptic number.

1399823 is a deficient number, since it is larger than the sum of its proper divisors (6097).

1399823 is an equidigital number, since it uses as much as digits as its factorization.

1399823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6096.

The product of its digits is 11664, while the sum is 35.

The square root of 1399823 is about 1183.1411581041. The cubic root of 1399823 is about 111.8641795346.

It can be divided in two parts, 1399 and 823, that added together give a palindrome (2222).

The spelling of 1399823 in words is "one million, three hundred ninety-nine thousand, eight hundred twenty-three".