5621618 has 8 divisors (see below), whose sum is σ = 8466012. Its totient is φ = 2799616.

The previous prime is 5621617. The next prime is 5621653. The reversal of 5621618 is 8161265.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3736489 + 1885129 = 1933^2 + 1373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5621617) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 4955 + ... + 5982.

Almost surely, 2^5621618 is an apocalyptic number.

5621618 is a deficient number, since it is larger than the sum of its proper divisors (2844394).

5621618 is a wasteful number, since it uses less digits than its factorization.

5621618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11196.

The product of its digits is 2880, while the sum is 29.

The square root of 5621618 is about 2370.9951497209. The cubic root of 5621618 is about 177.8090153731.

The spelling of 5621618 in words is "five million, six hundred twenty-one thousand, six hundred eighteen".