9820621404 has 144 divisors (see below), whose sum is σ = 28748079360. Its totient is φ = 2793669120.

The previous prime is 9820621367. The next prime is 9820621441. The reversal of 9820621404 is 4041260289.

9820621404 is a `hidden beast` number, since 9 + 8 + 20 + 621 + 4 + 0 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (9820621367) and next prime (9820621441).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2953687 + ... + 2957009.

It is an arithmetic number, because the mean of its divisors is an integer number (199639440).

Almost surely, 2^9820621404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9820621404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14374039680).

9820621404 is an abundant number, since it is smaller than the sum of its proper divisors (18927457956).

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

9820621404 is a wasteful number, since it uses less digits than its factorization.

9820621404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800 (or 3795 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 9820621404 is about 99099.0484515366. The cubic root of 9820621404 is about 2141.4749057461.

The spelling of 9820621404 in words is "nine billion, eight hundred twenty million, six hundred twenty-one thousand, four hundred four".