47185993 has 4 divisors (see below), whose sum is σ = 47206548. Its totient is φ = 47165440.

The previous prime is 47185981. The next prime is 47185997. The reversal of 47185993 is 39958174.

It is a happy number.

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 3268864 + 43917129 = 1808^2 + 6627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47185993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47185997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6328 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (11801637).

Almost surely, 2^47185993 is an apocalyptic number.

It is an amenable number.

47185993 is a deficient number, since it is larger than the sum of its proper divisors (20555).

47185993 is a wasteful number, since it uses less digits than its factorization.

47185993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20554.

The product of its digits is 272160, while the sum is 46.

The square root of 47185993 is about 6869.2061404503. The cubic root of 47185993 is about 361.3580214390.

Adding to 47185993 its product of digits (272160), we get a triangular number (47458153 = T₉₇₄₂).

The spelling of 47185993 in words is "forty-seven million, one hundred eighty-five thousand, nine hundred ninety-three".