38107921 has 8 divisors (see below), whose sum is σ = 38571624. Its totient is φ = 37647360.

The previous prime is 38107919. The next prime is 38107957. The reversal of 38107921 is 12970183.

It can be written as a sum of positive squares in 4 ways, for example, as 1638400 + 36469521 = 1280^2 + 6039^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 38107921 - 2¹ = 38107919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38107991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30705 + ... + 31921.

It is an arithmetic number, because the mean of its divisors is an integer number (4821453).

Almost surely, 2^38107921 is an apocalyptic number.

It is an amenable number.

38107921 is a deficient number, since it is larger than the sum of its proper divisors (463703).

38107921 is a wasteful number, since it uses less digits than its factorization.

38107921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 38107921 is about 6173.1613456964. The cubic root of 38107921 is about 336.5155098103.

The spelling of 38107921 in words is "thirty-eight million, one hundred seven thousand, nine hundred twenty-one".