7990198909 has 16 divisors (see below), whose sum is σ = 9967564800. Its totient is φ = 6222530160.

The previous prime is 7990198907. The next prime is 7990198927. The reversal of 7990198909 is 9098910997.

It is not a de Polignac number, because 7990198909 - 2¹ = 7990198907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7990198903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108192 + ... + 166390.

It is an arithmetic number, because the mean of its divisors is an integer number (622972800).

Almost surely, 2^7990198909 is an apocalyptic number.

It is an amenable number.

7990198909 is a deficient number, since it is larger than the sum of its proper divisors (1977365891).

7990198909 is a wasteful number, since it uses less digits than its factorization.

7990198909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60000.

The product of its (nonzero) digits is 3306744, while the sum is 61.

The square root of 7990198909 is about 89387.9125441466. The cubic root of 7990198909 is about 1999.1829086430.

The spelling of 7990198909 in words is "seven billion, nine hundred ninety million, one hundred ninety-eight thousand, nine hundred nine".