38791643 has 4 divisors (see below), whose sum is σ = 42318168. Its totient is φ = 35265120.

The previous prime is 38791609. The next prime is 38791661. The reversal of 38791643 is 34619783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34619783 = 11 ⋅3147253.

It is not a de Polignac number, because 38791643 - 2⁶ = 38791579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38791643.

It is not an unprimeable number, because it can be changed into a prime (38791693) 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 3 ways as a sum of consecutive naturals, for example, 1763246 + ... + 1763267.

It is an arithmetic number, because the mean of its divisors is an integer number (10579542).

Almost surely, 2^38791643 is an apocalyptic number.

38791643 is a deficient number, since it is larger than the sum of its proper divisors (3526525).

38791643 is a wasteful number, since it uses less digits than its factorization.

38791643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526524.

The product of its digits is 108864, while the sum is 41.

The square root of 38791643 is about 6228.2937470868. The cubic root of 38791643 is about 338.5161488368.

The spelling of 38791643 in words is "thirty-eight million, seven hundred ninety-one thousand, six hundred forty-three".