47644393 has 4 divisors (see below), whose sum is σ = 47814228. Its totient is φ = 47474560.

The previous prime is 47644391. The next prime is 47644397. The reversal of 47644393 is 39344674.

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 21049744 + 26594649 = 4588^2 + 5157^2 .

It is a cyclic number.

It is not a de Polignac number, because 47644393 - 2¹ = 47644391 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47644391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84496 + ... + 85057.

It is an arithmetic number, because the mean of its divisors is an integer number (11953557).

Almost surely, 2^47644393 is an apocalyptic number.

It is an amenable number.

47644393 is a deficient number, since it is larger than the sum of its proper divisors (169835).

47644393 is a wasteful number, since it uses less digits than its factorization.

47644393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169834.

The product of its digits is 217728, while the sum is 40.

The square root of 47644393 is about 6902.4917964457. The cubic root of 47644393 is about 362.5244197580.

The spelling of 47644393 in words is "forty-seven million, six hundred forty-four thousand, three hundred ninety-three".