7990001 has 2 divisors, whose sum is σ = 7990002. Its totient is φ = 7990000.

The previous prime is 7989973. The next prime is 7990057. The reversal of 7990001 is 1000997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7845601 + 144400 = 2801^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 7990001 - 2¹⁰ = 7988977 is a prime.

It is not a weakly prime, because it can be changed into another prime (7990091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995000 + 3995001.

It is an arithmetic number, because the mean of its divisors is an integer number (3995001).

Almost surely, 2^7990001 is an apocalyptic number.

It is an amenable number.

7990001 is a deficient number, since it is larger than the sum of its proper divisors (1).

7990001 is an equidigital number, since it uses as much as digits as its factorization.

7990001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 7990001 is about 2826.6589819078. The cubic root of 7990001 is about 199.9166402606.

Adding to 7990001 its reverse (1000997), we get a palindrome (8990998).

The spelling of 7990001 in words is "seven million, nine hundred ninety thousand, one".