825940638 has 20 divisors (see below), whose sum is σ = 1850719200. Its totient is φ = 275313492.

The previous prime is 825940627. The next prime is 825940667. The reversal of 825940638 is 836049528.

825940638 is a `hidden beast` number, since 8 + 2 + 5 + 9 + 4 + 0 + 638 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 825940593 and 825940602.

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 2549038 + ... + 2549361.

It is an arithmetic number, because the mean of its divisors is an integer number (92535960).

Almost surely, 2^825940638 is an apocalyptic number.

825940638 is an abundant number, since it is smaller than the sum of its proper divisors (1024778562).

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

825940638 is a wasteful number, since it uses less digits than its factorization.

825940638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5098413 (or 5098404 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 825940638 is about 28739.1829737729. The cubic root of 825940638 is about 938.2450423092.

The spelling of 825940638 in words is "eight hundred twenty-five million, nine hundred forty thousand, six hundred thirty-eight".