42706521 has 48 divisors (see below), whose sum is σ = 75216960. Its totient is φ = 23872320.

The previous prime is 42706511. The next prime is 42706541. The reversal of 42706521 is 12560724.

42706521 is a `hidden beast` number, since 4 + 2 + 7 + 0 + 652 + 1 = 666.

42706521 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 42706521 - 2¹⁰ = 42705497 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (42706511) 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 47 ways as a sum of consecutive naturals, for example, 34135 + ... + 35363.

It is an arithmetic number, because the mean of its divisors is an integer number (1567020).

Almost surely, 2^42706521 is an apocalyptic number.

It is an amenable number.

42706521 is a deficient number, since it is larger than the sum of its proper divisors (32510439).

42706521 is a wasteful number, since it uses less digits than its factorization.

42706521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 42706521 is about 6535.0226472446. The cubic root of 42706521 is about 349.5409519329.

The spelling of 42706521 in words is "forty-two million, seven hundred six thousand, five hundred twenty-one".