6406618 has 4 divisors (see below), whose sum is σ = 9609930. Its totient is φ = 3203308.

The previous prime is 6406601. The next prime is 6406639. The reversal of 6406618 is 8166046.

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

It can be written as a sum of positive squares in only one way, i.e., 3932289 + 2474329 = 1983^2 + 1573^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6406618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1601653 + ... + 1601656.

Almost surely, 2^6406618 is an apocalyptic number.

6406618 is a deficient number, since it is larger than the sum of its proper divisors (3203312).

6406618 is a wasteful number, since it uses less digits than its factorization.

6406618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203311.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 6406618 is about 2531.1297872689. The cubic root of 6406618 is about 185.7275272046.

The spelling of 6406618 in words is "six million, four hundred six thousand, six hundred eighteen".