38691839 has 4 divisors (see below), whose sum is σ = 39046920. Its totient is φ = 38336760.

The previous prime is 38691811. The next prime is 38691841. The reversal of 38691839 is 93819683.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38691839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 38691793 and 38691802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38691859) 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, 177377 + ... + 177594.

It is an arithmetic number, because the mean of its divisors is an integer number (9761730).

Almost surely, 2^38691839 is an apocalyptic number.

38691839 is a deficient number, since it is larger than the sum of its proper divisors (355081).

38691839 is a wasteful number, since it uses less digits than its factorization.

38691839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355080.

The product of its digits is 279936, while the sum is 47.

The square root of 38691839 is about 6220.2764408023. The cubic root of 38691839 is about 338.2255855515.

The spelling of 38691839 in words is "thirty-eight million, six hundred ninety-one thousand, eight hundred thirty-nine".