290987 has 2 divisors, whose sum is σ = 290988. Its totient is φ = 290986.

The previous prime is 290971. The next prime is 290993. The reversal of 290987 is 789092.

290987 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 290987 - 2⁴ = 290971 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 290987.

It is not a weakly prime, because it can be changed into another prime (296987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145493 + 145494.

It is an arithmetic number, because the mean of its divisors is an integer number (145494).

2²⁹⁰⁹⁸⁷ is an apocalyptic number.

290987 is a deficient number, since it is larger than the sum of its proper divisors (1).

290987 is an equidigital number, since it uses as much as digits as its factorization.

290987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 290987 is about 539.4321087959. The cubic root of 290987 is about 66.2660670655.

The spelling of 290987 in words is "two hundred ninety thousand, nine hundred eighty-seven".