290997947 has 2 divisors, whose sum is σ = 290997948. Its totient is φ = 290997946.

The previous prime is 290997923. The next prime is 290997991. The reversal of 290997947 is 749799092.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 290997947 - 2⁸ = 290997691 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 290997892 and 290997901.

It is not a weakly prime, because it can be changed into another prime (290997647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145498973 + 145498974.

It is an arithmetic number, because the mean of its divisors is an integer number (145498974).

Almost surely, 2^290997947 is an apocalyptic number.

290997947 is a deficient number, since it is larger than the sum of its proper divisors (1).

290997947 is an equidigital number, since it uses as much as digits as its factorization.

290997947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 56.

The square root of 290997947 is about 17058.6619346302. The cubic root of 290997947 is about 662.6689803676.

The spelling of 290997947 in words is "two hundred ninety million, nine hundred ninety-seven thousand, nine hundred forty-seven".