47917638 has 24 divisors (see below), whose sum is σ = 105246648. Its totient is φ = 15753312.

The previous prime is 47917637. The next prime is 47917651. The reversal of 47917638 is 83671974.

47917638 is a `hidden beast` number, since 4 + 7 + 9 + 1 + 7 + 638 = 666.

47917638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×47917638² = 4592200062998088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 47917593 and 47917602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47917631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16920 + ... + 19547.

It is an arithmetic number, because the mean of its divisors is an integer number (4385277).

Almost surely, 2^47917638 is an apocalyptic number.

47917638 is an abundant number, since it is smaller than the sum of its proper divisors (57329010).

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

47917638 is a wasteful number, since it uses less digits than its factorization.

47917638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36548 (or 36545 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 47917638 is about 6922.2567129513. The cubic root of 47917638 is about 363.2161361106.

The spelling of 47917638 in words is "forty-seven million, nine hundred seventeen thousand, six hundred thirty-eight".