38139405 has 32 divisors (see below), whose sum is σ = 64088064. Its totient is φ = 19331136.

The previous prime is 38139391. The next prime is 38139433. The reversal of 38139405 is 50493183.

38139405 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 38139405 - 2⁵ = 38139373 is a prime.

It is a super-2 number, since 2×38139405² = 2909228427508050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 78072 + ... + 78558.

It is an arithmetic number, because the mean of its divisors is an integer number (2002752).

Almost surely, 2^38139405 is an apocalyptic number.

It is an amenable number.

38139405 is a deficient number, since it is larger than the sum of its proper divisors (25948659).

38139405 is a wasteful number, since it uses less digits than its factorization.

38139405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 38139405 is about 6175.7108902538. The cubic root of 38139405 is about 336.6081584218.

The spelling of 38139405 in words is "thirty-eight million, one hundred thirty-nine thousand, four hundred five".