7239958721 has 16 divisors (see below), whose sum is σ = 7905163200. Its totient is φ = 6604452288.

The previous prime is 7239958681. The next prime is 7239958727. The reversal of 7239958721 is 1278599327.

It is a happy number.

It is not a de Polignac number, because 7239958721 - 2¹⁸ = 7239696577 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7239958727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187910 + ... + 223136.

It is an arithmetic number, because the mean of its divisors is an integer number (494072700).

Almost surely, 2^7239958721 is an apocalyptic number.

It is an amenable number.

7239958721 is a deficient number, since it is larger than the sum of its proper divisors (665204479).

7239958721 is a wasteful number, since it uses less digits than its factorization.

7239958721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35648.

The product of its digits is 1905120, while the sum is 53.

The square root of 7239958721 is about 85087.9469784058. The cubic root of 7239958721 is about 1934.5443775436.

The spelling of 7239958721 in words is "seven billion, two hundred thirty-nine million, nine hundred fifty-eight thousand, seven hundred twenty-one".