38438040181 has 2 divisors, whose sum is σ = 38438040182. Its totient is φ = 38438040180.

The previous prime is 38438040163. The next prime is 38438040217. The reversal of 38438040181 is 18104083483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34080852100 + 4357188081 = 184610^2 + 66009^2 .

It is a cyclic number.

It is not a de Polignac number, because 38438040181 - 2²⁹ = 37901169269 is a prime.

It is a super-2 number, since 2×38438040181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38438040101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19219020090 + 19219020091.

It is an arithmetic number, because the mean of its divisors is an integer number (19219020091).

Almost surely, 2^38438040181 is an apocalyptic number.

It is an amenable number.

38438040181 is a deficient number, since it is larger than the sum of its proper divisors (1).

38438040181 is an equidigital number, since it uses as much as digits as its factorization.

38438040181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 38438040181 in words is "thirty-eight billion, four hundred thirty-eight million, forty thousand, one hundred eighty-one".