290394721 has 2 divisors, whose sum is σ = 290394722. Its totient is φ = 290394720.

The previous prime is 290394707. The next prime is 290394733. The reversal of 290394721 is 127493092.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206928225 + 83466496 = 14385^2 + 9136^2 .

It is a cyclic number.

It is not a de Polignac number, because 290394721 - 2¹³ = 290386529 is a prime.

It is not a weakly prime, because it can be changed into another prime (290394751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145197360 + 145197361.

It is an arithmetic number, because the mean of its divisors is an integer number (145197361).

Almost surely, 2^290394721 is an apocalyptic number.

It is an amenable number.

290394721 is a deficient number, since it is larger than the sum of its proper divisors (1).

290394721 is an equidigital number, since it uses as much as digits as its factorization.

290394721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 290394721 is about 17040.9718326157. The cubic root of 290394721 is about 662.2107690126.

The spelling of 290394721 in words is "two hundred ninety million, three hundred ninety-four thousand, seven hundred twenty-one".