47009993 has 4 divisors (see below), whose sum is σ = 47897028. Its totient is φ = 46122960.

The previous prime is 47009987. The next prime is 47010013. The reversal of 47009993 is 39990074.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39990074 = 2 ⋅19995037.

It can be written as a sum of positive squares in 2 ways, for example, as 12588304 + 34421689 = 3548^2 + 5867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47009993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 47009993.

It is not an unprimeable number, because it can be changed into a prime (47009923) 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, 443438 + ... + 443543.

It is an arithmetic number, because the mean of its divisors is an integer number (11974257).

Almost surely, 2^47009993 is an apocalyptic number.

It is an amenable number.

47009993 is a deficient number, since it is larger than the sum of its proper divisors (887035).

47009993 is an equidigital number, since it uses as much as digits as its factorization.

47009993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887034.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 47009993 is about 6856.3833760956. The cubic root of 47009993 is about 360.9081827965.

The spelling of 47009993 in words is "forty-seven million, nine thousand, nine hundred ninety-three".