42356509 has 16 divisors (see below), whose sum is σ = 47885824. Its totient is φ = 37195200.

The previous prime is 42356507. The next prime is 42356539. The reversal of 42356509 is 90565324.

42356509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42356509 - 2¹ = 42356507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42356507) 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, 23722 + ... + 25444.

It is an arithmetic number, because the mean of its divisors is an integer number (2992864).

Almost surely, 2^42356509 is an apocalyptic number.

It is an amenable number.

42356509 is a deficient number, since it is larger than the sum of its proper divisors (5529315).

42356509 is a wasteful number, since it uses less digits than its factorization.

42356509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 42356509 is about 6508.1878430174. The cubic root of 42356509 is about 348.5834144005.

The spelling of 42356509 in words is "forty-two million, three hundred fifty-six thousand, five hundred nine".