38643620 has 12 divisors (see below), whose sum is σ = 81151644. Its totient is φ = 15457440.

The previous prime is 38643599. The next prime is 38643623. The reversal of 38643620 is 2634683.

38643620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30713764 + 7929856 = 5542^2 + 2816^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38643623) 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, 966071 + ... + 966110.

It is an arithmetic number, because the mean of its divisors is an integer number (6762637).

Almost surely, 2^38643620 is an apocalyptic number.

It is an amenable number.

38643620 is an abundant number, since it is smaller than the sum of its proper divisors (42508024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38643620 is a wasteful number, since it uses less digits than its factorization.

38643620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932190 (or 1932188 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 38643620 is about 6216.3992793256. The cubic root of 38643620 is about 338.0850246519.

The spelling of 38643620 in words is "thirty-eight million, six hundred forty-three thousand, six hundred twenty".