285609397 has 4 divisors (see below), whose sum is σ = 292251520. Its totient is φ = 278967276.

The previous prime is 285609353. The next prime is 285609431. The reversal of 285609397 is 793906582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 285609397 - 2¹¹ = 285607349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 285609397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285609307) 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, 3320997 + ... + 3321082.

It is an arithmetic number, because the mean of its divisors is an integer number (73062880).

Almost surely, 2^285609397 is an apocalyptic number.

It is an amenable number.

285609397 is a deficient number, since it is larger than the sum of its proper divisors (6642123).

285609397 is an equidigital number, since it uses as much as digits as its factorization.

285609397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6642122.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 285609397 is about 16899.9821597539. The cubic root of 285609397 is about 658.5531490212.

The spelling of 285609397 in words is "two hundred eighty-five million, six hundred nine thousand, three hundred ninety-seven".