8404379281 has 4 divisors (see below), whose sum is σ = 8409514932. Its totient is φ = 8399243632.

The previous prime is 8404379261. The next prime is 8404379287. The reversal of 8404379281 is 1829734048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 959450625 + 7444928656 = 30975^2 + 86284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8404379281 is a prime.

It is a super-2 number, since 2×8404379281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8404379287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565370 + ... + 2568643.

It is an arithmetic number, because the mean of its divisors is an integer number (2102378733).

Almost surely, 2^8404379281 is an apocalyptic number.

It is an amenable number.

8404379281 is a deficient number, since it is larger than the sum of its proper divisors (5135651).

8404379281 is a wasteful number, since it uses less digits than its factorization.

8404379281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5135650.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 8404379281 is about 91675.4017225995. The cubic root of 8404379281 is about 2033.1459129919.

The spelling of 8404379281 in words is "eight billion, four hundred four million, three hundred seventy-nine thousand, two hundred eighty-one".