38216993 has 4 divisors (see below), whose sum is σ = 38267460. Its totient is φ = 38166528.

The previous prime is 38216963. The next prime is 38217019. The reversal of 38216993 is 39961283.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39961283 = 61 ⋅655103.

It can be written as a sum of positive squares in 2 ways, for example, as 5234944 + 32982049 = 2288^2 + 5743^2 .

It is a cyclic number.

It is not a de Polignac number, because 38216993 - 2¹⁴ = 38200609 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 38216993.

It is not an unprimeable number, because it can be changed into a prime (38216903) 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, 24080 + ... + 25617.

It is an arithmetic number, because the mean of its divisors is an integer number (9566865).

Almost surely, 2^38216993 is an apocalyptic number.

It is an amenable number.

38216993 is a deficient number, since it is larger than the sum of its proper divisors (50467).

38216993 is an equidigital number, since it uses as much as digits as its factorization.

38216993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50466.

The product of its digits is 69984, while the sum is 41.

The square root of 38216993 is about 6181.9894047143. The cubic root of 38216993 is about 336.8362607723.

The spelling of 38216993 in words is "thirty-eight million, two hundred sixteen thousand, nine hundred ninety-three".