285397523 has 4 divisors (see below), whose sum is σ = 285839280. Its totient is φ = 284955768.

The previous prime is 285397507. The next prime is 285397531. The reversal of 285397523 is 325793582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 285397523 - 2⁴ = 285397507 is a prime.

It is a super-2 number, since 2×285397523² = 162903492269071058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285397543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219908 + ... + 221201.

It is an arithmetic number, because the mean of its divisors is an integer number (71459820).

Almost surely, 2^285397523 is an apocalyptic number.

285397523 is a deficient number, since it is larger than the sum of its proper divisors (441757).

285397523 is an equidigital number, since it uses as much as digits as its factorization.

285397523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441756.

The product of its digits is 453600, while the sum is 44.

The square root of 285397523 is about 16893.7125286303. The cubic root of 285397523 is about 658.3902636163.

The spelling of 285397523 in words is "two hundred eighty-five million, three hundred ninety-seven thousand, five hundred twenty-three".