525810138 has 64 divisors (see below), whose sum is σ = 1231718400. Its totient is φ = 146532672.

The previous prime is 525810121. The next prime is 525810143. The reversal of 525810138 is 831018525.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 525810099 and 525810108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442381 + ... + 443567.

It is an arithmetic number, because the mean of its divisors is an integer number (19245600).

Almost surely, 2^525810138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 525810138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (615859200).

525810138 is an abundant number, since it is smaller than the sum of its proper divisors (705908262).

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

525810138 is a wasteful number, since it uses less digits than its factorization.

525810138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 525810138 is about 22930.5503204786. The cubic root of 525810138 is about 807.1290620900.

The spelling of 525810138 in words is "five hundred twenty-five million, eight hundred ten thousand, one hundred thirty-eight".