47117844 has 18 divisors (see below), whose sum is σ = 119103530. Its totient is φ = 15705936.

The previous prime is 47117797. The next prime is 47117849. The reversal of 47117844 is 44871174.

It can be written as a sum of positive squares in only one way, i.e., 44355600 + 2762244 = 6660^2 + 1662^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1308829 = 47117844 / (4 + 7 + 1 + 1 + 7 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 47117799 and 47117808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47117849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654379 + ... + 654450.

Almost surely, 2^47117844 is an apocalyptic number.

It is an amenable number.

47117844 is an abundant number, since it is smaller than the sum of its proper divisors (71985686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47117844 is a wasteful number, since it uses less digits than its factorization.

47117844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308839 (or 1308834 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 47117844 is about 6864.2438767864. The cubic root of 47117844 is about 361.1839722398.

It can be divided in two parts, 47117 and 844, that added together give a square (47961 = 219²).

The spelling of 47117844 in words is "forty-seven million, one hundred seventeen thousand, eight hundred forty-four".