38091909 has 4 divisors (see below), whose sum is σ = 50789216. Its totient is φ = 25394604.

The previous prime is 38091899. The next prime is 38091931. The reversal of 38091909 is 90919083.

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: 90919083 = 3 ⋅30306361.

It is a de Polignac number, because none of the positive numbers 2^k-38091909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38092909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6348649 + ... + 6348654.

It is an arithmetic number, because the mean of its divisors is an integer number (12697304).

Almost surely, 2^38091909 is an apocalyptic number.

It is an amenable number.

38091909 is a deficient number, since it is larger than the sum of its proper divisors (12697307).

38091909 is a wasteful number, since it uses less digits than its factorization.

38091909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12697306.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 38091909 is about 6171.8643050540. The cubic root of 38091909 is about 336.4683713935.

The spelling of 38091909 in words is "thirty-eight million, ninety-one thousand, nine hundred nine".