1368737729 has 4 divisors (see below), whose sum is σ = 1368812484. Its totient is φ = 1368662976.

The previous prime is 1368737719. The next prime is 1368737753. The reversal of 1368737729 is 9277378631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9277378631 = 37 ⋅250739963.

It can be written as a sum of positive squares in 2 ways, for example, as 908721025 + 460016704 = 30145^2 + 21448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1368737729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1368737719) 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, 10709 + ... + 53405.

It is an arithmetic number, because the mean of its divisors is an integer number (342203121).

Almost surely, 2^1368737729 is an apocalyptic number.

It is an amenable number.

1368737729 is a deficient number, since it is larger than the sum of its proper divisors (74755).

1368737729 is an equidigital number, since it uses as much as digits as its factorization.

1368737729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74754.

The product of its digits is 2667168, while the sum is 53.

The square root of 1368737729 is about 36996.4556275328. The cubic root of 1368737729 is about 1110.2993346322.

The spelling of 1368737729 in words is "one billion, three hundred sixty-eight million, seven hundred thirty-seven thousand, seven hundred twenty-nine".