47781393 has 16 divisors (see below), whose sum is σ = 71380416. Its totient is φ = 28175040.

The previous prime is 47781343. The next prime is 47781397. The reversal of 47781393 is 39318774.

It is not a de Polignac number, because 47781393 - 2⁶ = 47781329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47781397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18346 + ... + 20787.

It is an arithmetic number, because the mean of its divisors is an integer number (4461276).

Almost surely, 2^47781393 is an apocalyptic number.

It is an amenable number.

47781393 is a deficient number, since it is larger than the sum of its proper divisors (23599023).

47781393 is a wasteful number, since it uses less digits than its factorization.

47781393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39184.

The product of its digits is 127008, while the sum is 42.

The square root of 47781393 is about 6912.4086250742. The cubic root of 47781393 is about 362.8715632103.

The spelling of 47781393 in words is "forty-seven million, seven hundred eighty-one thousand, three hundred ninety-three".