38636226721 has 3 divisors (see below), whose sum is σ = 38636423283. Its totient is φ = 38636030160.

The previous prime is 38636226659. The next prime is 38636226737. The reversal of 38636226721 is 12762263683.

The square root of 38636226721 is 196561.

It is a perfect power (a square), and thus also a powerful number.

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: 12762263683 = 13 ⋅981712591.

It can be written as a sum of positive squares in only one way, i.e., 21871156321 + 16765070400 = 147889^2 + 129480^2 .

It is not a de Polignac number, because 38636226721 - 2⁷ = 38636226593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38636226121) 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 2 ways as a sum of consecutive naturals, for example, 98281 + ... + 294841.

It is an arithmetic number, because the mean of its divisors is an integer number (12878807761).

Almost surely, 2^38636226721 is an apocalyptic number.

38636226721 is the 196561-st square number.

38636226721 is the 98281-st centered octagonal number.

It is an amenable number.

38636226721 is a deficient number, since it is larger than the sum of its proper divisors (196562).

38636226721 is an frugal number, since it uses more digits than its factorization.

38636226721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393122 (or 196561 counting only the distinct ones).

The product of its digits is 870912, while the sum is 46.

The spelling of 38636226721 in words is "thirty-eight billion, six hundred thirty-six million, two hundred twenty-six thousand, seven hundred twenty-one".