838420639 has 8 divisors (see below), whose sum is σ = 978582528. Its totient is φ = 703355640.

The previous prime is 838420591. The next prime is 838420643. The reversal of 838420639 is 936024838.

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 838420639 - 2¹³ = 838412447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 838420595 and 838420604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838420669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1273867 + ... + 1274524.

It is an arithmetic number, because the mean of its divisors is an integer number (122322816).

Almost surely, 2^838420639 is an apocalyptic number.

838420639 is a deficient number, since it is larger than the sum of its proper divisors (140161889).

838420639 is a wasteful number, since it uses less digits than its factorization.

838420639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548445.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 838420639 is about 28955.4941073365. The cubic root of 838420639 is about 942.9470804681.

The spelling of 838420639 in words is "eight hundred thirty-eight million, four hundred twenty thousand, six hundred thirty-nine".