838321840 has 40 divisors (see below), whose sum is σ = 2011978368. Its totient is φ = 324510720.

The previous prime is 838321837. The next prime is 838321873. The reversal of 838321840 is 48123838.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 838321840.

It is an unprimeable number.

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, 166537 + ... + 171496.

Almost surely, 2^838321840 is an apocalyptic number.

838321840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

838321840 is an abundant number, since it is smaller than the sum of its proper divisors (1173656528).

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

838321840 is a wasteful number, since it uses less digits than its factorization.

838321840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338077 (or 338071 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 838321840 is about 28953.7880077892. The cubic root of 838321840 is about 942.9100402348.

The spelling of 838321840 in words is "eight hundred thirty-eight million, three hundred twenty-one thousand, eight hundred forty".