290424721 has 4 divisors (see below), whose sum is σ = 295185844. Its totient is φ = 285663600.

The previous prime is 290424697. The next prime is 290424731. The reversal of 290424721 is 127424092.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54464400 + 235960321 = 7380^2 + 15361^2 .

It is a cyclic number.

It is not a de Polignac number, because 290424721 - 2⁷ = 290424593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290424731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2380470 + ... + 2380591.

It is an arithmetic number, because the mean of its divisors is an integer number (73796461).

Almost surely, 2^290424721 is an apocalyptic number.

It is an amenable number.

290424721 is a deficient number, since it is larger than the sum of its proper divisors (4761123).

290424721 is an equidigital number, since it uses as much as digits as its factorization.

290424721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4761122.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 290424721 is about 17041.8520413716. The cubic root of 290424721 is about 662.2335720430.

The spelling of 290424721 in words is "two hundred ninety million, four hundred twenty-four thousand, seven hundred twenty-one".