8538221385 has 12 divisors (see below), whose sum is σ = 14799583812. Its totient is φ = 4553718048.

The previous prime is 8538221339. The next prime is 8538221399. The reversal of 8538221385 is 5831228358.

8538221385 is a `hidden beast` number, since 8 + 538 + 22 + 13 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3312232704 + 5225988681 = 57552^2 + 72291^2 .

It is not a de Polignac number, because 8538221385 - 2⁷ = 8538221257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 189738253 = 8538221385 / (8 + 5 + 3 + 8 + 2 + 2 + 1 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 8538221385.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94869082 + ... + 94869171.

It is an arithmetic number, because the mean of its divisors is an integer number (1233298651).

Almost surely, 2^8538221385 is an apocalyptic number.

It is an amenable number.

8538221385 is a deficient number, since it is larger than the sum of its proper divisors (6261362427).

8538221385 is a wasteful number, since it uses less digits than its factorization.

8538221385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189738264 (or 189738261 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 8538221385 is about 92402.4966383485. The cubic root of 8538221385 is about 2043.8819285820.

The spelling of 8538221385 in words is "eight billion, five hundred thirty-eight million, two hundred twenty-one thousand, three hundred eighty-five".