383609891 has 4 divisors (see below), whose sum is σ = 438411312. Its totient is φ = 328808472.

The previous prime is 383609881. The next prime is 383610011. The reversal of 383609891 is 198906383.

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

It is a cyclic number.

It is not a de Polignac number, because 383609891 - 2¹⁰ = 383608867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (383609851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27400700 + ... + 27400713.

It is an arithmetic number, because the mean of its divisors is an integer number (109602828).

Almost surely, 2^383609891 is an apocalyptic number.

383609891 is a deficient number, since it is larger than the sum of its proper divisors (54801421).

383609891 is an equidigital number, since it uses as much as digits as its factorization.

383609891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54801420.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 383609891 is about 19585.9615796621. The cubic root of 383609891 is about 726.6020165482.

The spelling of 383609891 in words is "three hundred eighty-three million, six hundred nine thousand, eight hundred ninety-one".