39708381 has 4 divisors (see below), whose sum is σ = 52944512. Its totient is φ = 26472252.

The previous prime is 39708359. The next prime is 39708397. The reversal of 39708381 is 18380793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18380793 = 3 ⋅6126931.

It is not a de Polignac number, because 39708381 - 2¹⁰ = 39707357 is a prime.

It is a super-2 number, since 2×39708381² = 3153511043282322, 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 (39708341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6618061 + ... + 6618066.

It is an arithmetic number, because the mean of its divisors is an integer number (13236128).

Almost surely, 2^39708381 is an apocalyptic number.

It is an amenable number.

39708381 is a deficient number, since it is larger than the sum of its proper divisors (13236131).

39708381 is a wasteful number, since it uses less digits than its factorization.

39708381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13236130.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 39708381 is about 6301.4586406641. The cubic root of 39708381 is about 341.1620589451.

The spelling of 39708381 in words is "thirty-nine million, seven hundred eight thousand, three hundred eighty-one".