38993779 has 4 divisors (see below), whose sum is σ = 42538680. Its totient is φ = 35448880.

The previous prime is 38993771. The next prime is 38993797. The reversal of 38993779 is 97739983.

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

It is a cyclic number.

It is not a de Polignac number, because 38993779 - 2³ = 38993771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38993771) 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, 1772434 + ... + 1772455.

It is an arithmetic number, because the mean of its divisors is an integer number (10634670).

Almost surely, 2^38993779 is an apocalyptic number.

38993779 is a deficient number, since it is larger than the sum of its proper divisors (3544901).

38993779 is a wasteful number, since it uses less digits than its factorization.

38993779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544900.

The product of its digits is 2571912, while the sum is 55.

The square root of 38993779 is about 6244.4998999119. The cubic root of 38993779 is about 339.1031119525.

The spelling of 38993779 in words is "thirty-eight million, nine hundred ninety-three thousand, seven hundred seventy-nine".