38918731 has 4 divisors (see below), whose sum is σ = 38962000. Its totient is φ = 38875464.

The previous prime is 38918723. The next prime is 38918753. The reversal of 38918731 is 13781983.

38918731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 38918731 - 2³ = 38918723 is a prime.

It is a super-2 number, since 2×38918731² = 3029335245300722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38918771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20256 + ... + 22093.

It is an arithmetic number, because the mean of its divisors is an integer number (9740500).

Almost surely, 2^38918731 is an apocalyptic number.

38918731 is a deficient number, since it is larger than the sum of its proper divisors (43269).

38918731 is an equidigital number, since it uses as much as digits as its factorization.

38918731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43268.

The product of its digits is 36288, while the sum is 40.

The square root of 38918731 is about 6238.4878776832. The cubic root of 38918731 is about 338.8854246274.

The spelling of 38918731 in words is "thirty-eight million, nine hundred eighteen thousand, seven hundred thirty-one".