39938638 has 4 divisors (see below), whose sum is σ = 59907960. Its totient is φ = 19969318.

The previous prime is 39938629. The next prime is 39938653. The reversal of 39938638 is 83683993.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 39938591 and 39938600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9984658 + ... + 9984661.

It is an arithmetic number, because the mean of its divisors is an integer number (14976990).

Almost surely, 2^39938638 is an apocalyptic number.

39938638 is a deficient number, since it is larger than the sum of its proper divisors (19969322).

39938638 is a wasteful number, since it uses less digits than its factorization.

39938638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19969321.

The product of its digits is 839808, while the sum is 49.

The square root of 39938638 is about 6319.7023664094. The cubic root of 39938638 is about 341.8202205945.

It can be divided in two parts, 399386 and 38, that added together give a square (399424 = 632²).

The spelling of 39938638 in words is "thirty-nine million, nine hundred thirty-eight thousand, six hundred thirty-eight".