42647121 has 16 divisors (see below), whose sum is σ = 68925120. Its totient is φ = 25846560.

The previous prime is 42647107. The next prime is 42647131. The reversal of 42647121 is 12174624.

42647121 is a `hidden beast` number, since 4 + 2 + 647 + 12 + 1 = 666.

42647121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42647121 - 2⁶ = 42647057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42647131) 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 15 ways as a sum of consecutive naturals, for example, 71500 + ... + 72093.

It is an arithmetic number, because the mean of its divisors is an integer number (4307820).

Almost surely, 2^42647121 is an apocalyptic number.

It is an amenable number.

42647121 is a deficient number, since it is larger than the sum of its proper divisors (26277999).

42647121 is a wasteful number, since it uses less digits than its factorization.

42647121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143613 (or 143607 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 42647121 is about 6530.4763225970. The cubic root of 42647121 is about 349.3788192678.

The spelling of 42647121 in words is "forty-two million, six hundred forty-seven thousand, one hundred twenty-one".