1361729 has 4 divisors (see below), whose sum is σ = 1387476. Its totient is φ = 1335984.

The previous prime is 1361713. The next prime is 1361741. The reversal of 1361729 is 9271631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9271631 = 1583 ⋅5857.

It can be written as a sum of positive squares in 2 ways, for example, as 1106704 + 255025 = 1052^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361729 - 2⁴ = 1361713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361029) 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, 12794 + ... + 12899.

It is an arithmetic number, because the mean of its divisors is an integer number (346869).

2^1361729 is an apocalyptic number.

It is an amenable number.

1361729 is a deficient number, since it is larger than the sum of its proper divisors (25747).

1361729 is an equidigital number, since it uses as much as digits as its factorization.

1361729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25746.

The product of its digits is 2268, while the sum is 29.

The square root of 1361729 is about 1166.9314461441. The cubic root of 1361729 is about 110.8400965716.

The spelling of 1361729 in words is "one million, three hundred sixty-one thousand, seven hundred twenty-nine".