285997039 has 4 divisors (see below), whose sum is σ = 286500240. Its totient is φ = 285493840.

The previous prime is 285997003. The next prime is 285997051. The reversal of 285997039 is 930799582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930799582 = 2 ⋅465399791.

It is a cyclic number.

It is not a de Polignac number, because 285997039 - 2⁹ = 285996527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285997639) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 250747 + ... + 251884.

It is an arithmetic number, because the mean of its divisors is an integer number (71625060).

Almost surely, 2^285997039 is an apocalyptic number.

285997039 is a deficient number, since it is larger than the sum of its proper divisors (503201).

285997039 is an equidigital number, since it uses as much as digits as its factorization.

285997039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503200.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The square root of 285997039 is about 16911.4469812609. The cubic root of 285997039 is about 658.8509537102.

The spelling of 285997039 in words is "two hundred eighty-five million, nine hundred ninety-seven thousand, thirty-nine".