1972320729 has 4 divisors (see below), whose sum is σ = 2629760976. Its totient is φ = 1314880484.

The previous prime is 1972320709. The next prime is 1972320731. The reversal of 1972320729 is 9270232791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1972320729 - 2⁵ = 1972320697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1972320709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328720119 + ... + 328720124.

It is an arithmetic number, because the mean of its divisors is an integer number (657440244).

Almost surely, 2^1972320729 is an apocalyptic number.

It is an amenable number.

1972320729 is a deficient number, since it is larger than the sum of its proper divisors (657440247).

1972320729 is an equidigital number, since it uses as much as digits as its factorization.

1972320729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657440246.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 1972320729 is about 44410.8177024472. The cubic root of 1972320729 is about 1254.0817458265.

The spelling of 1972320729 in words is "one billion, nine hundred seventy-two million, three hundred twenty thousand, seven hundred twenty-nine".