38621813 has 16 divisors (see below), whose sum is σ = 41817600. Its totient is φ = 35558640.

The previous prime is 38621801. The next prime is 38621819. The reversal of 38621813 is 31812683.

It is a happy number.

38621813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38621813 - 2⁴ = 38621797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38621813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38621819) 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 15 ways as a sum of consecutive naturals, for example, 146720 + ... + 146982.

It is an arithmetic number, because the mean of its divisors is an integer number (2613600).

Almost surely, 2^38621813 is an apocalyptic number.

It is an amenable number.

38621813 is a deficient number, since it is larger than the sum of its proper divisors (3195787).

38621813 is a wasteful number, since it uses less digits than its factorization.

38621813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472.

The product of its digits is 6912, while the sum is 32.

The square root of 38621813 is about 6214.6450421565. The cubic root of 38621813 is about 338.0214177108.

The spelling of 38621813 in words is "thirty-eight million, six hundred twenty-one thousand, eight hundred thirteen".