47081993 has 24 divisors (see below), whose sum is σ = 60021000. Its totient is φ = 36653568.

The previous prime is 47081987. The next prime is 47082023. The reversal of 47081993 is 39918074.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20322064 + 26759929 = 4508^2 + 5173^2 .

It is not a de Polignac number, because 47081993 - 2⁴ = 47081977 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 47081993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47081093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23183 + ... + 25131.

It is an arithmetic number, because the mean of its divisors is an integer number (2500875).

Almost surely, 2^47081993 is an apocalyptic number.

It is an amenable number.

47081993 is a deficient number, since it is larger than the sum of its proper divisors (12939007).

47081993 is a wasteful number, since it uses less digits than its factorization.

47081993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009 (or 2002 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 47081993 is about 6861.6319487422. The cubic root of 47081993 is about 361.0923431736.

The spelling of 47081993 in words is "forty-seven million, eighty-one thousand, nine hundred ninety-three".