383868991 has 6 divisors (see below), whose sum is σ = 421938776. Its totient is φ = 348971700.

The previous prime is 383868973. The next prime is 383868997. The reversal of 383868991 is 199868383.

It is a happy number.

It is not a de Polignac number, because 383868991 - 2¹¹ = 383866943 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 (383868997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1586115 + ... + 1586356.

Almost surely, 2^383868991 is an apocalyptic number.

383868991 is a deficient number, since it is larger than the sum of its proper divisors (38069785).

383868991 is a wasteful number, since it uses less digits than its factorization.

383868991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172493 (or 3172482 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The square root of 383868991 is about 19592.5748945870. The cubic root of 383868991 is about 726.7655683031.

The spelling of 383868991 in words is "three hundred eighty-three million, eight hundred sixty-eight thousand, nine hundred ninety-one".