38220391 has 12 divisors (see below), whose sum is σ = 42596176. Its totient is φ = 34261920.

The previous prime is 38220383. The next prime is 38220401. The reversal of 38220391 is 19302283.

38220391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38220391 - 2³ = 38220383 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38220311) 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 11 ways as a sum of consecutive naturals, for example, 6670 + ... + 10996.

Almost surely, 2^38220391 is an apocalyptic number.

38220391 is a deficient number, since it is larger than the sum of its proper divisors (4375785).

38220391 is a wasteful number, since it uses less digits than its factorization.

38220391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422 (or 4411 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 38220391 is about 6182.2642292286. The cubic root of 38220391 is about 336.8462435540.

The spelling of 38220391 in words is "thirty-eight million, two hundred twenty thousand, three hundred ninety-one".