618621 has 8 divisors (see below), whose sum is σ = 868320. Its totient is φ = 390672.

The previous prime is 618619. The next prime is 618637. The reversal of 618621 is 126816.

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

It is not a de Polignac number, because 618621 - 2¹ = 618619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 618591 and 618600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618671) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 5370 + ... + 5483.

It is an arithmetic number, because the mean of its divisors is an integer number (108540).

2⁶¹⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

618621 is a deficient number, since it is larger than the sum of its proper divisors (249699).

618621 is a wasteful number, since it uses less digits than its factorization.

618621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10875.

The product of its digits is 576, while the sum is 24.

The square root of 618621 is about 786.5246340707. The cubic root of 618621 is about 85.2069237689.

The spelling of 618621 in words is "six hundred eighteen thousand, six hundred twenty-one".