1399723 has 4 divisors (see below), whose sum is σ = 1507408. Its totient is φ = 1292040.

The previous prime is 1399721. The next prime is 1399733. The reversal of 1399723 is 3279931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3279931 = 1201 ⋅2731.

It is a cyclic number.

It is not a de Polignac number, because 1399723 - 2¹ = 1399721 is a prime.

It is a Duffinian number.

1399723 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1399721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53823 + ... + 53848.

It is an arithmetic number, because the mean of its divisors is an integer number (376852).

2^1399723 is an apocalyptic number.

1399723 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1399723 is a deficient number, since it is larger than the sum of its proper divisors (107685).

1399723 is a wasteful number, since it uses less digits than its factorization.

1399723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107684.

The product of its digits is 10206, while the sum is 34.

The square root of 1399723 is about 1183.0988969651. The cubic root of 1399723 is about 111.8615157016.

The spelling of 1399723 in words is "one million, three hundred ninety-nine thousand, seven hundred twenty-three".