38938909 has 8 divisors (see below), whose sum is σ = 40352760. Its totient is φ = 37529856.

The previous prime is 38938903. The next prime is 38938943. The reversal of 38938909 is 90983983.

It can be written as a sum of positive squares in 4 ways, for example, as 3572100 + 35366809 = 1890^2 + 5947^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 38938909 - 2³ = 38938901 is a prime.

It is a super-2 number, since 2×38938909² = 3032477268220562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38938901) 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 7 ways as a sum of consecutive naturals, for example, 26457 + ... + 27889.

It is an arithmetic number, because the mean of its divisors is an integer number (5044095).

Almost surely, 2^38938909 is an apocalyptic number.

It is an amenable number.

38938909 is a deficient number, since it is larger than the sum of its proper divisors (1413851).

38938909 is a wasteful number, since it uses less digits than its factorization.

38938909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 38938909 is about 6240.1048869390. The cubic root of 38938909 is about 338.9439812530.

The spelling of 38938909 in words is "thirty-eight million, nine hundred thirty-eight thousand, nine hundred nine".