38913905 has 4 divisors (see below), whose sum is σ = 46696692. Its totient is φ = 31131120.

The previous prime is 38913887. The next prime is 38913937. The reversal of 38913905 is 50931983.

38913905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50931983 = 17 ⋅2995999.

It can be written as a sum of positive squares in 2 ways, for example, as 24137569 + 14776336 = 4913^2 + 3844^2 .

It is not a de Polignac number, because 38913905 - 2⁶ = 38913841 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 3891386 + ... + 3891395.

It is an arithmetic number, because the mean of its divisors is an integer number (11674173).

Almost surely, 2^38913905 is an apocalyptic number.

It is an amenable number.

38913905 is a deficient number, since it is larger than the sum of its proper divisors (7782787).

38913905 is an equidigital number, since it uses as much as digits as its factorization.

38913905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7782786.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 38913905 is about 6238.1010732434. The cubic root of 38913905 is about 338.8714165596.

It can be divided in two parts, 389 and 13905, that multiplied together give a palindrome (5409045).

The spelling of 38913905 in words is "thirty-eight million, nine hundred thirteen thousand, nine hundred five".