38639930 has 24 divisors (see below), whose sum is σ = 80908308. Its totient is φ = 13247808.

The previous prime is 38639899. The next prime is 38639933. The reversal of 38639930 is 3993683.

38639930 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 37173409 + 1466521 = 6097^2 + 1211^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38639933) 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 11 ways as a sum of consecutive naturals, for example, 38939 + ... + 39918.

Almost surely, 2^38639930 is an apocalyptic number.

38639930 is an abundant number, since it is smaller than the sum of its proper divisors (42268378).

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

38639930 is a wasteful number, since it uses less digits than its factorization.

38639930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78878 (or 78871 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 38639930 is about 6216.1024766328. The cubic root of 38639930 is about 338.0742632942.

The spelling of 38639930 in words is "thirty-eight million, six hundred thirty-nine thousand, nine hundred thirty".