7990009 has 8 divisors (see below), whose sum is σ = 8127360. Its totient is φ = 7854000.

The previous prime is 7990001. The next prime is 7990057. The reversal of 7990009 is 9000997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7990009 - 2³ = 7990001 is a prime.

It is a Duffinian number.

7990009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7990001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23974 + ... + 24304.

It is an arithmetic number, because the mean of its divisors is an integer number (1015920).

Almost surely, 2^7990009 is an apocalyptic number.

It is an amenable number.

7990009 is a deficient number, since it is larger than the sum of its proper divisors (137351).

7990009 is a wasteful number, since it uses less digits than its factorization.

7990009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 7990009 is about 2826.6603970056. The cubic root of 7990009 is about 199.9167069828.

The spelling of 7990009 in words is "seven million, nine hundred ninety thousand, nine".