384826139 has 4 divisors (see below), whose sum is σ = 385066920. Its totient is φ = 384585360.

The previous prime is 384826073. The next prime is 384826151. The reversal of 384826139 is 931628483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931628483 = 419 ⋅2223457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-384826139 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 384826139.

It is not an unprimeable number, because it can be changed into a prime (384826199) 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, 117977 + ... + 121194.

It is an arithmetic number, because the mean of its divisors is an integer number (96266730).

Almost surely, 2^384826139 is an apocalyptic number.

384826139 is a deficient number, since it is larger than the sum of its proper divisors (240781).

384826139 is a wasteful number, since it uses less digits than its factorization.

384826139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240780.

The product of its digits is 248832, while the sum is 44.

The square root of 384826139 is about 19616.9859815416. The cubic root of 384826139 is about 727.3691117565.

The spelling of 384826139 in words is "three hundred eighty-four million, eight hundred twenty-six thousand, one hundred thirty-nine".