7893509989 has 4 divisors (see below), whose sum is σ = 8357834124. Its totient is φ = 7429185856.

The previous prime is 7893509977. The next prime is 7893510019. The reversal of 7893509989 is 9899053987.

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 6384809025 + 1508700964 = 79905^2 + 38842^2 .

It is a cyclic number.

It is not a de Polignac number, because 7893509989 - 2²⁵ = 7859955557 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 (7893509089) 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, 232162042 + ... + 232162075.

It is an arithmetic number, because the mean of its divisors is an integer number (2089458531).

Almost surely, 2^7893509989 is an apocalyptic number.

It is an amenable number.

7893509989 is a deficient number, since it is larger than the sum of its proper divisors (464324135).

7893509989 is a wasteful number, since it uses less digits than its factorization.

7893509989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464324134.

The product of its (nonzero) digits is 44089920, while the sum is 67.

The square root of 7893509989 is about 88845.4275075538. The cubic root of 7893509989 is about 1991.0861631952.

The spelling of 7893509989 in words is "seven billion, eight hundred ninety-three million, five hundred nine thousand, nine hundred eighty-nine".