838405725 has 24 divisors (see below), whose sum is σ = 1387104672. Its totient is φ = 446846400.

The previous prime is 838405717. The next prime is 838405727. The reversal of 838405725 is 527504838.

It is not a de Polignac number, because 838405725 - 2³ = 838405717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838405727) 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 23 ways as a sum of consecutive naturals, for example, 147435 + ... + 153015.

It is an arithmetic number, because the mean of its divisors is an integer number (57796028).

Almost surely, 2^838405725 is an apocalyptic number.

It is an amenable number.

838405725 is a deficient number, since it is larger than the sum of its proper divisors (548698947).

838405725 is a wasteful number, since it uses less digits than its factorization.

838405725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7597 (or 7592 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The square root of 838405725 is about 28955.2365730277. The cubic root of 838405725 is about 942.9414893223.

The spelling of 838405725 in words is "eight hundred thirty-eight million, four hundred five thousand, seven hundred twenty-five".