38783993 has 4 divisors (see below), whose sum is σ = 38804340. Its totient is φ = 38763648.

The previous prime is 38783989. The next prime is 38784001. The reversal of 38783993 is 39938783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39938783 = 977 ⋅40879.

It can be written as a sum of positive squares in 2 ways, for example, as 9320809 + 29463184 = 3053^2 + 5428^2 .

It is a cyclic number.

It is not a de Polignac number, because 38783993 - 2² = 38783989 is a prime.

It is a super-2 number, since 2×38783993² = 3008396226048098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38783923) 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, 6980 + ... + 11237.

It is an arithmetic number, because the mean of its divisors is an integer number (9701085).

Almost surely, 2^38783993 is an apocalyptic number.

It is an amenable number.

38783993 is a deficient number, since it is larger than the sum of its proper divisors (20347).

38783993 is a wasteful number, since it uses less digits than its factorization.

38783993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20346.

The product of its digits is 979776, while the sum is 50.

The square root of 38783993 is about 6227.6795839221. The cubic root of 38783993 is about 338.4938947413.

The spelling of 38783993 in words is "thirty-eight million, seven hundred eighty-three thousand, nine hundred ninety-three".