38438040191 has 4 divisors (see below), whose sum is σ = 38440261272. Its totient is φ = 38435819112.

The previous prime is 38438040181. The next prime is 38438040217. The reversal of 38438040191 is 19104083483.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38438040191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38438040101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084376 + ... + 1119261.

It is an arithmetic number, because the mean of its divisors is an integer number (9610065318).

Almost surely, 2^38438040191 is an apocalyptic number.

38438040191 is a deficient number, since it is larger than the sum of its proper divisors (2221081).

38438040191 is a wasteful number, since it uses less digits than its factorization.

38438040191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221080.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 38438040191 in words is "thirty-eight billion, four hundred thirty-eight million, forty thousand, one hundred ninety-one".