6989867849 has 8 divisors (see below), whose sum is σ = 7484195880. Its totient is φ = 6504779776.

The previous prime is 6989867791. The next prime is 6989867867. The reversal of 6989867849 is 9487689896.

It can be written as a sum of positive squares in 4 ways, for example, as 71824 + 6989796025 = 268^2 + 83605^2 .

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 6989867849 - 2³² = 2694900553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6989867869) 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, 2308424 + ... + 2311449.

It is an arithmetic number, because the mean of its divisors is an integer number (935524485).

Almost surely, 2^6989867849 is an apocalyptic number.

It is an amenable number.

6989867849 is a deficient number, since it is larger than the sum of its proper divisors (494328031).

6989867849 is a wasteful number, since it uses less digits than its factorization.

6989867849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4619979.

The product of its digits is 376233984, while the sum is 74.

The square root of 6989867849 is about 83605.4295425841. The cubic root of 6989867849 is about 1912.0077795977.

The spelling of 6989867849 in words is "six billion, nine hundred eighty-nine million, eight hundred sixty-seven thousand, eight hundred forty-nine".