8449894381 has 4 divisors (see below), whose sum is σ = 8450128764. Its totient is φ = 8449660000.

The previous prime is 8449894379. The next prime is 8449894417. The reversal of 8449894381 is 1834989448.

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 4319775625 + 4130118756 = 65725^2 + 64266^2 .

It is a cyclic number.

It is not a de Polignac number, because 8449894381 - 2¹ = 8449894379 is a prime.

It is a super-2 number, since 2×8449894381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8449814381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50440 + ... + 139441.

It is an arithmetic number, because the mean of its divisors is an integer number (2112532191).

Almost surely, 2^8449894381 is an apocalyptic number.

It is an amenable number.

8449894381 is a deficient number, since it is larger than the sum of its proper divisors (234383).

8449894381 is a wasteful number, since it uses less digits than its factorization.

8449894381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234382.

The product of its digits is 7962624, while the sum is 58.

The square root of 8449894381 is about 91923.3070608320. The cubic root of 8449894381 is about 2036.8095699531.

The spelling of 8449894381 in words is "eight billion, four hundred forty-nine million, eight hundred ninety-four thousand, three hundred eighty-one".