38309921 has 8 divisors (see below), whose sum is σ = 41473320. Its totient is φ = 35177472.

The previous prime is 38309851. The next prime is 38309933. The reversal of 38309921 is 12990383.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 38254225 = 236^2 + 6185^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38309921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38309981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5126 + ... + 10143.

It is an arithmetic number, because the mean of its divisors is an integer number (5184165).

Almost surely, 2^38309921 is an apocalyptic number.

It is an amenable number.

38309921 is a deficient number, since it is larger than the sum of its proper divisors (3163399).

38309921 is a wasteful number, since it uses less digits than its factorization.

38309921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15475.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 38309921 is about 6189.5008684061. The cubic root of 38309921 is about 337.1090555074.

The spelling of 38309921 in words is "thirty-eight million, three hundred nine thousand, nine hundred twenty-one".