6649198 has 4 divisors (see below), whose sum is σ = 9973800. Its totient is φ = 3324598.

The previous prime is 6649189. The next prime is 6649199. The reversal of 6649198 is 8919466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8919466 = 2 ⋅4459733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1662298 + ... + 1662301.

It is an arithmetic number, because the mean of its divisors is an integer number (2493450).

Almost surely, 2^6649198 is an apocalyptic number.

6649198 is a deficient number, since it is larger than the sum of its proper divisors (3324602).

6649198 is a wasteful number, since it uses less digits than its factorization.

6649198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324601.

The product of its digits is 93312, while the sum is 43.

The square root of 6649198 is about 2578.6038858266. The cubic root of 6649198 is about 188.0426755391.

The spelling of 6649198 in words is "six million, six hundred forty-nine thousand, one hundred ninety-eight".