525307986 has 48 divisors (see below), whose sum is σ = 1307427264. Its totient is φ = 149319072.

The previous prime is 525307957. The next prime is 525307987. The reversal of 525307986 is 689703525.

It is a happy number.

525307986 is a `hidden beast` number, since 525 + 30 + 7 + 98 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (525307987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14241 + ... + 35403.

It is an arithmetic number, because the mean of its divisors is an integer number (27238068).

Almost surely, 2^525307986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 525307986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (653713632).

525307986 is an abundant number, since it is smaller than the sum of its proper divisors (782119278).

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

525307986 is a wasteful number, since it uses less digits than its factorization.

525307986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21375 (or 21372 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 525307986 is about 22919.5982949091. The cubic root of 525307986 is about 806.8720424716.

It can be divided in two parts, 52530 and 7986, that added together give a square (60516 = 246²).

The spelling of 525307986 in words is "five hundred twenty-five million, three hundred seven thousand, nine hundred eighty-six".