7423721811 has 24 divisors (see below), whose sum is σ = 11748228336. Its totient is φ = 4479901440.

The previous prime is 7423721797. The next prime is 7423721821. The reversal of 7423721811 is 1181273247.

7423721811 is a `hidden beast` number, since 7 + 423 + 7 + 218 + 11 = 666.

It is not a de Polignac number, because 7423721811 - 2⁵ = 7423721779 is a prime.

It is a super-2 number, since 2×7423721811² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (7423721821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137850 + ... + 183983.

It is an arithmetic number, because the mean of its divisors is an integer number (489509514).

Almost surely, 2^7423721811 is an apocalyptic number.

7423721811 is a deficient number, since it is larger than the sum of its proper divisors (4324506525).

7423721811 is a wasteful number, since it uses less digits than its factorization.

7423721811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322083 (or 322080 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 7423721811 is about 86161.0225740155. The cubic root of 7423721811 is about 1950.7752176116.

The spelling of 7423721811 in words is "seven billion, four hundred twenty-three million, seven hundred twenty-one thousand, eight hundred eleven".