47393781 has 8 divisors (see below), whose sum is σ = 64899744. Its totient is φ = 30741840.

The previous prime is 47393729. The next prime is 47393791. The reversal of 47393781 is 18739374.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 47393781 - 2⁷ = 47393653 is a prime.

It is a super-2 number, since 2×47393781² = 4492340954951922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47393791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213375 + ... + 213596.

It is an arithmetic number, because the mean of its divisors is an integer number (8112468).

Almost surely, 2^47393781 is an apocalyptic number.

It is an amenable number.

47393781 is a deficient number, since it is larger than the sum of its proper divisors (17505963).

47393781 is a wasteful number, since it uses less digits than its factorization.

47393781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427011.

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

The square root of 47393781 is about 6884.3141270572. The cubic root of 47393781 is about 361.8876695312.

It can be divided in two parts, 47 and 393781, that added together give a triangular number (393828 = T₈₈₇).

The spelling of 47393781 in words is "forty-seven million, three hundred ninety-three thousand, seven hundred eighty-one".