38721173 has 2 divisors, whose sum is σ = 38721174. Its totient is φ = 38721172.

The previous prime is 38721161. The next prime is 38721181. The reversal of 38721173 is 37112783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27478564 + 11242609 = 5242^2 + 3353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38721173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38721103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19360586 + 19360587.

It is an arithmetic number, because the mean of its divisors is an integer number (19360587).

Almost surely, 2^38721173 is an apocalyptic number.

It is an amenable number.

38721173 is a deficient number, since it is larger than the sum of its proper divisors (1).

38721173 is an equidigital number, since it uses as much as digits as its factorization.

38721173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 38721173 is about 6222.6339278476. The cubic root of 38721173 is about 338.3110385680.

The spelling of 38721173 in words is "thirty-eight million, seven hundred twenty-one thousand, one hundred seventy-three".