6998638 has 4 divisors (see below), whose sum is σ = 10497960. Its totient is φ = 3499318.

The previous prime is 6998627. The next prime is 6998681. The reversal of 6998638 is 8368996.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6998591 and 6998600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1749658 + ... + 1749661.

It is an arithmetic number, because the mean of its divisors is an integer number (2624490).

Almost surely, 2^6998638 is an apocalyptic number.

6998638 is a deficient number, since it is larger than the sum of its proper divisors (3499322).

6998638 is a wasteful number, since it uses less digits than its factorization.

6998638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499321.

The product of its digits is 559872, while the sum is 49.

The square root of 6998638 is about 2645.4939047369. The cubic root of 6998638 is about 191.2807107474.

The spelling of 6998638 in words is "six million, nine hundred ninety-eight thousand, six hundred thirty-eight".