38781893 has 4 divisors (see below), whose sum is σ = 38798988. Its totient is φ = 38764800.

The previous prime is 38781889. The next prime is 38781937. The reversal of 38781893 is 39818783.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31561924 + 7219969 = 5618^2 + 2687^2 .

It is a cyclic number.

It is not a de Polignac number, because 38781893 - 2² = 38781889 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 (38781293) 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, 4508 + ... + 9893.

It is an arithmetic number, because the mean of its divisors is an integer number (9699747).

Almost surely, 2^38781893 is an apocalyptic number.

It is an amenable number.

38781893 is a deficient number, since it is larger than the sum of its proper divisors (17095).

38781893 is a wasteful number, since it uses less digits than its factorization.

38781893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17094.

The product of its digits is 290304, while the sum is 47.

The square root of 38781893 is about 6227.5109795166. The cubic root of 38781893 is about 338.4877852619.

The spelling of 38781893 in words is "thirty-eight million, seven hundred eighty-one thousand, eight hundred ninety-three".