290990987 has 16 divisors (see below), whose sum is σ = 336322560. Its totient is φ = 246617568.

The previous prime is 290990971. The next prime is 290991007. The reversal of 290990987 is 789099092.

It is a cyclic number.

It is not a de Polignac number, because 290990987 - 2⁴ = 290990971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (290996987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267158 + ... + 268244.

It is an arithmetic number, because the mean of its divisors is an integer number (21020160).

Almost surely, 2^290990987 is an apocalyptic number.

290990987 is a deficient number, since it is larger than the sum of its proper divisors (45331573).

290990987 is a wasteful number, since it uses less digits than its factorization.

290990987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 290990987 is about 17058.4579314779. The cubic root of 290990987 is about 662.6636971540.

The spelling of 290990987 in words is "two hundred ninety million, nine hundred ninety thousand, nine hundred eighty-seven".