1396729 has 4 divisors (see below), whose sum is σ = 1410660. Its totient is φ = 1382800.

The previous prime is 1396723. The next prime is 1396751. The reversal of 1396729 is 9276931.

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

It can be written as a sum of positive squares in 2 ways, for example, as 837225 + 559504 = 915^2 + 748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1396729 - 2⁵ = 1396697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6814 + ... + 7015.

It is an arithmetic number, because the mean of its divisors is an integer number (352665).

2^1396729 is an apocalyptic number.

It is an amenable number.

1396729 is a deficient number, since it is larger than the sum of its proper divisors (13931).

1396729 is a wasteful number, since it uses less digits than its factorization.

1396729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13930.

The product of its digits is 20412, while the sum is 37.

The square root of 1396729 is about 1181.8328985098. The cubic root of 1396729 is about 111.7817017063.

Adding to 1396729 its product of digits (20412), we get a palindrome (1417141).

The spelling of 1396729 in words is "one million, three hundred ninety-six thousand, seven hundred twenty-nine".