38711813 has 12 divisors (see below), whose sum is σ = 45133740. Its totient is φ = 33106752.

The previous prime is 38711809. The next prime is 38711821. The reversal of 38711813 is 31811783.

It can be written as a sum of positive squares in 2 ways, for example, as 19201924 + 19509889 = 4382^2 + 4417^2 .

It is not a de Polignac number, because 38711813 - 2² = 38711809 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 38711813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38711843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40145 + ... + 41097.

It is an arithmetic number, because the mean of its divisors is an integer number (3761145).

Almost surely, 2^38711813 is an apocalyptic number.

It is an amenable number.

38711813 is a deficient number, since it is larger than the sum of its proper divisors (6421927).

38711813 is an equidigital number, since it uses as much as digits as its factorization.

38711813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796 (or 1789 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 38711813 is about 6221.8817892982. The cubic root of 38711813 is about 338.2837765968.

The spelling of 38711813 in words is "thirty-eight million, seven hundred eleven thousand, eight hundred thirteen".