1375391729 has 4 divisors (see below), whose sum is σ = 1422819060. Its totient is φ = 1327964400.

The previous prime is 1375391723. The next prime is 1375391761. The reversal of 1375391729 is 9271935731.

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 281568400 + 1093823329 = 16780^2 + 33073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1375391729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375391723) 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, 23713622 + ... + 23713679.

It is an arithmetic number, because the mean of its divisors is an integer number (355704765).

Almost surely, 2^1375391729 is an apocalyptic number.

It is an amenable number.

1375391729 is a deficient number, since it is larger than the sum of its proper divisors (47427331).

1375391729 is an equidigital number, since it uses as much as digits as its factorization.

1375391729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47427330.

The product of its digits is 357210, while the sum is 47.

The square root of 1375391729 is about 37086.2741320829. The cubic root of 1375391729 is about 1112.0956349546.

The spelling of 1375391729 in words is "one billion, three hundred seventy-five million, three hundred ninety-one thousand, seven hundred twenty-nine".