7997388509 has 8 divisors (see below), whose sum is σ = 8725082400. Its totient is φ = 7269804400.

The previous prime is 7997388481. The next prime is 7997388613. The reversal of 7997388509 is 9058837997.

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 7997388509 - 2⁸ = 7997388253 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 (7997388709) 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, 229574 + ... + 262104.

It is an arithmetic number, because the mean of its divisors is an integer number (1090635300).

Almost surely, 2^7997388509 is an apocalyptic number.

It is an amenable number.

7997388509 is a deficient number, since it is larger than the sum of its proper divisors (727693891).

7997388509 is a wasteful number, since it uses less digits than its factorization.

7997388509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54891.

The product of its (nonzero) digits is 34292160, while the sum is 65.

The square root of 7997388509 is about 89428.1192299156. The cubic root of 7997388509 is about 1999.7823520655.

The spelling of 7997388509 in words is "seven billion, nine hundred ninety-seven million, three hundred eighty-eight thousand, five hundred nine".