6998639 has 4 divisors (see below), whose sum is σ = 7117320. Its totient is φ = 6879960.

The previous prime is 6998627. The next prime is 6998681. The reversal of 6998639 is 9368996.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6998639 - 2⁴ = 6998623 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 (6998039) 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, 59252 + ... + 59369.

It is an arithmetic number, because the mean of its divisors is an integer number (1779330).

Almost surely, 2^6998639 is an apocalyptic number.

6998639 is a deficient number, since it is larger than the sum of its proper divisors (118681).

6998639 is a wasteful number, since it uses less digits than its factorization.

6998639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118680.

The product of its digits is 629856, while the sum is 50.

The square root of 6998639 is about 2645.4940937375. The cubic root of 6998639 is about 191.2807198578.

The spelling of 6998639 in words is "six million, nine hundred ninety-eight thousand, six hundred thirty-nine".