618430821 has 8 divisors (see below), whose sum is σ = 826341984. Its totient is φ = 411403440.

The previous prime is 618430819. The next prime is 618430843. The reversal of 618430821 is 128034816.

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

It is not a de Polignac number, because 618430821 - 2¹ = 618430819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618434821) 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 7 ways as a sum of consecutive naturals, for example, 219310 + ... + 222111.

It is an arithmetic number, because the mean of its divisors is an integer number (103292748).

Almost surely, 2^618430821 is an apocalyptic number.

It is an amenable number.

618430821 is a deficient number, since it is larger than the sum of its proper divisors (207911163).

618430821 is a wasteful number, since it uses less digits than its factorization.

618430821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441891.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 618430821 is about 24868.2693607738. The cubic root of 618430821 is about 851.9819132024.

The spelling of 618430821 in words is "six hundred eighteen million, four hundred thirty thousand, eight hundred twenty-one".