383861891 has 8 divisors (see below), whose sum is σ = 440285280. Its totient is φ = 327835008.

The previous prime is 383861879. The next prime is 383861897. The reversal of 383861891 is 198168383.

It is a happy number.

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 383861891 - 2¹⁴ = 383845507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (383861897) 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, 97046 + ... + 100923.

It is an arithmetic number, because the mean of its divisors is an integer number (55035660).

Almost surely, 2^383861891 is an apocalyptic number.

383861891 is a deficient number, since it is larger than the sum of its proper divisors (56423389).

383861891 is a wasteful number, since it uses less digits than its factorization.

383861891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198253.

The product of its digits is 248832, while the sum is 47.

The square root of 383861891 is about 19592.3937026592. The cubic root of 383861891 is about 726.7610875493.

The spelling of 383861891 in words is "three hundred eighty-three million, eight hundred sixty-one thousand, eight hundred ninety-one".