38691641 has 4 divisors (see below), whose sum is σ = 39067392. Its totient is φ = 38315892.

The previous prime is 38691599. The next prime is 38691647. The reversal of 38691641 is 14619683.

38691641 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38691641 - 2¹⁸ = 38429497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 38691595 and 38691604.

It is not an unprimeable number, because it can be changed into a prime (38691647) by changing a digit.

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, 187721 + ... + 187926.

It is an arithmetic number, because the mean of its divisors is an integer number (9766848).

Almost surely, 2^38691641 is an apocalyptic number.

It is an amenable number.

38691641 is a deficient number, since it is larger than the sum of its proper divisors (375751).

38691641 is a wasteful number, since it uses less digits than its factorization.

38691641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375750.

The product of its digits is 31104, while the sum is 38.

The square root of 38691641 is about 6220.2605250906. The cubic root of 38691641 is about 338.2250086100.

The spelling of 38691641 in words is "thirty-eight million, six hundred ninety-one thousand, six hundred forty-one".