290239885 has 16 divisors (see below), whose sum is σ = 375739056. Its totient is φ = 213954048.

The previous prime is 290239883. The next prime is 290239907. The reversal of 290239885 is 588932092.

It can be written as a sum of positive squares in 8 ways, for example, as 64609444 + 225630441 = 8038^2 + 15021^2 .

It is a cyclic number.

It is not a de Polignac number, because 290239885 - 2¹ = 290239883 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 (290239883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36487 + ... + 43723.

It is an arithmetic number, because the mean of its divisors is an integer number (23483691).

Almost surely, 2^290239885 is an apocalyptic number.

It is an amenable number.

290239885 is a deficient number, since it is larger than the sum of its proper divisors (85499171).

290239885 is a wasteful number, since it uses less digits than its factorization.

290239885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7872.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 290239885 is about 17036.4281761172. The cubic root of 290239885 is about 662.0930530349.

The spelling of 290239885 in words is "two hundred ninety million, two hundred thirty-nine thousand, eight hundred eighty-five".