6218440 has 16 divisors (see below), whose sum is σ = 13991580. Its totient is φ = 2487360.

The previous prime is 6218431. The next prime is 6218449. The reversal of 6218440 is 448126.

It is an interprime number because it is at equal distance from previous prime (6218431) and next prime (6218449).

It can be written as a sum of positive squares in 2 ways, for example, as 5731236 + 487204 = 2394^2 + 698^2 .

It is not an unprimeable number, because it can be changed into a prime (6218449) 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, 77691 + ... + 77770.

Almost surely, 2^6218440 is an apocalyptic number.

It is an amenable number.

6218440 is an abundant number, since it is smaller than the sum of its proper divisors (7773140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6218440 is a wasteful number, since it uses less digits than its factorization.

6218440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155472 (or 155468 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 6218440 is about 2493.6800115492. The cubic root of 6218440 is about 183.8910034992.

The spelling of 6218440 in words is "six million, two hundred eighteen thousand, four hundred forty".