383138999 has 4 divisors (see below), whose sum is σ = 384827064. Its totient is φ = 381450936.

The previous prime is 383138989. The next prime is 383139011. The reversal of 383138999 is 999831383.

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 383138999 - 2⁴ = 383138983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 383138999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (383138989) 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, 843692 + ... + 844145.

It is an arithmetic number, because the mean of its divisors is an integer number (96206766).

Almost surely, 2^383138999 is an apocalyptic number.

383138999 is a deficient number, since it is larger than the sum of its proper divisors (1688065).

383138999 is a wasteful number, since it uses less digits than its factorization.

383138999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688064.

The product of its digits is 1259712, while the sum is 53.

The square root of 383138999 is about 19573.9367271890. The cubic root of 383138999 is about 726.3045866327.

The spelling of 383138999 in words is "three hundred eighty-three million, one hundred thirty-eight thousand, nine hundred ninety-nine".