525280399 has 16 divisors (see below), whose sum is σ = 656142336. Its totient is φ = 410083200.

The previous prime is 525280391. The next prime is 525280409. The reversal of 525280399 is 993082525.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 525280399 - 2³ = 525280391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525280391) 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 15 ways as a sum of consecutive naturals, for example, 67507 + ... + 74884.

It is an arithmetic number, because the mean of its divisors is an integer number (41008896).

Almost surely, 2^525280399 is an apocalyptic number.

525280399 is a deficient number, since it is larger than the sum of its proper divisors (130861937).

525280399 is a wasteful number, since it uses less digits than its factorization.

525280399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142446.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 525280399 is about 22918.9964658141. The cubic root of 525280399 is about 806.8579176983.

The spelling of 525280399 in words is "five hundred twenty-five million, two hundred eighty thousand, three hundred ninety-nine".