838967640 has 128 divisors (see below), whose sum is σ = 2882718720. Its totient is φ = 191347200.

The previous prime is 838967621. The next prime is 838967671. The reversal of 838967640 is 46769838.

838967640 = T₃₉₉ + T₄₀₀ + ... + T₁₇₂₀.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 554485 + ... + 555995.

It is an arithmetic number, because the mean of its divisors is an integer number (22521240).

Almost surely, 2^838967640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 838967640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441359360).

838967640 is an abundant number, since it is smaller than the sum of its proper divisors (2043751080).

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

838967640 is a wasteful number, since it uses less digits than its factorization.

838967640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193 (or 2189 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 838967640 is about 28964.9381149002. The cubic root of 838967640 is about 943.1521012106.

The spelling of 838967640 in words is "eight hundred thirty-eight million, nine hundred sixty-seven thousand, six hundred forty".