38721974841 has 81 divisors (see below), whose sum is σ = 63119093583. Its totient is φ = 22857848640.

The previous prime is 38721974831. The next prime is 38721974861. The reversal of 38721974841 is 14847912783.

The square root of 38721974841 is 196779.

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

38721974841 is a `hidden beast` number, since 3 + 8 + 72 + 1 + 97 + 484 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7435440441 + 31286534400 = 86229^2 + 176880^2 .

It is not a de Polignac number, because 38721974841 - 2²⁵ = 38688420409 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38721974801) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 435078325 + ... + 435078413.

Almost surely, 2^38721974841 is an apocalyptic number.

38721974841 is the 196779-th square number.

38721974841 is the 98390-th centered octagonal number.

It is an amenable number.

38721974841 is a deficient number, since it is larger than the sum of its proper divisors (24397118742).

38721974841 is an equidigital number, since it uses as much as digits as its factorization.

38721974841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 170 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The spelling of 38721974841 in words is "thirty-eight billion, seven hundred twenty-one million, nine hundred seventy-four thousand, eight hundred forty-one".