7844221404 has 18 divisors (see below), whose sum is σ = 19828448640. Its totient is φ = 2614740456.

The previous prime is 7844221313. The next prime is 7844221409. The reversal of 7844221404 is 4041224487.

7844221404 is a `hidden beast` number, since 78 + 442 + 2 + 140 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 217895039 = 7844221404 / (7 + 8 + 4 + 4 + 2 + 2 + 1 + 4 + 0 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7844221409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108947484 + ... + 108947555.

It is an arithmetic number, because the mean of its divisors is an integer number (1101580480).

Almost surely, 2^7844221404 is an apocalyptic number.

It is an amenable number.

7844221404 is an abundant number, since it is smaller than the sum of its proper divisors (11984227236).

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

7844221404 is a wasteful number, since it uses less digits than its factorization.

7844221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217895049 (or 217895044 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 36.

The square root of 7844221404 is about 88567.6092259467. The cubic root of 7844221404 is about 1986.9332664883.

The spelling of 7844221404 in words is "seven billion, eight hundred forty-four million, two hundred twenty-one thousand, four hundred four".