6218638 has 4 divisors (see below), whose sum is σ = 9327960. Its totient is φ = 3109318.

The previous prime is 6218623. The next prime is 6218647. The reversal of 6218638 is 8368126.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1554658 + ... + 1554661.

It is an arithmetic number, because the mean of its divisors is an integer number (2331990).

Almost surely, 2^6218638 is an apocalyptic number.

6218638 is a deficient number, since it is larger than the sum of its proper divisors (3109322).

6218638 is a wasteful number, since it uses less digits than its factorization.

6218638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109321.

The product of its digits is 13824, while the sum is 34.

The square root of 6218638 is about 2493.7197115955. The cubic root of 6218638 is about 183.8929552230.

The spelling of 6218638 in words is "six million, two hundred eighteen thousand, six hundred thirty-eight".