47749 has 4 divisors (see below), whose sum is σ = 51436. Its totient is φ = 44064.

The previous prime is 47743. The next prime is 47777. The reversal of 47749 is 94774.

47749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94774 = 2 ⋅47387.

It can be written as a sum of positive squares in 2 ways, for example, as 4900 + 42849 = 70^2 + 207^2 .

It is a cyclic number.

It is not a de Polignac number, because 47749 - 2³ = 47741 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 47749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47741) 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, 1824 + ... + 1849.

It is an arithmetic number, because the mean of its divisors is an integer number (12859).

2⁴⁷⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

47749 is a deficient number, since it is larger than the sum of its proper divisors (3687).

47749 is a wasteful number, since it uses less digits than its factorization.

47749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686.

The product of its digits is 7056, while the sum is 31.

The square root of 47749 is about 218.5154456783. The cubic root of 47749 is about 36.2789542748.

The spelling of 47749 in words is "forty-seven thousand, seven hundred forty-nine".