383920391 has 4 divisors (see below), whose sum is σ = 385568352. Its totient is φ = 382272432.

The previous prime is 383920373. The next prime is 383920423. The reversal of 383920391 is 193029383.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-383920391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (383920331) 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 3 ways as a sum of consecutive naturals, for example, 823631 + ... + 824096.

It is an arithmetic number, because the mean of its divisors is an integer number (96392088).

Almost surely, 2^383920391 is an apocalyptic number.

383920391 is a deficient number, since it is larger than the sum of its proper divisors (1647961).

383920391 is a wasteful number, since it uses less digits than its factorization.

383920391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647960.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 383920391 is about 19593.8865720918. The cubic root of 383920391 is about 726.7980047887.

The spelling of 383920391 in words is "three hundred eighty-three million, nine hundred twenty thousand, three hundred ninety-one".