38720391 has 8 divisors (see below), whose sum is σ = 51829104. Its totient is φ = 25712640.

The previous prime is 38720387. The next prime is 38720417. The reversal of 38720391 is 19302783.

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

It is not a de Polignac number, because 38720391 - 2² = 38720387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38720351) 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, 24340 + ... + 25881.

It is an arithmetic number, because the mean of its divisors is an integer number (6478638).

Almost surely, 2^38720391 is an apocalyptic number.

38720391 is a deficient number, since it is larger than the sum of its proper divisors (13108713).

38720391 is a wasteful number, since it uses less digits than its factorization.

38720391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50481.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 38720391 is about 6222.5710924022. The cubic root of 38720391 is about 338.3087610801.

The spelling of 38720391 in words is "thirty-eight million, seven hundred twenty thousand, three hundred ninety-one".