838420640 has 48 divisors (see below), whose sum is σ = 1982504160. Its totient is φ = 335074560.

The previous prime is 838420591. The next prime is 838420643. The reversal of 838420640 is 46024838.

It is a self number, because there is not a number n which added to its sum of digits gives 838420640.

It is not an unprimeable number, because it can be changed into a prime (838420643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339731 + ... + 342189.

It is an arithmetic number, because the mean of its divisors is an integer number (41302170).

Almost surely, 2^838420640 is an apocalyptic number.

838420640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

838420640 is an abundant number, since it is smaller than the sum of its proper divisors (1144083520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

838420640 is a wasteful number, since it uses less digits than its factorization.

838420640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4605 (or 4597 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 838420640 is about 28955.4941246044. The cubic root of 838420640 is about 942.9470808430.

The spelling of 838420640 in words is "eight hundred thirty-eight million, four hundred twenty thousand, six hundred forty".