42840135 has 48 divisors (see below), whose sum is σ = 81236064. Its totient is φ = 20756736.

The previous prime is 42840131. The next prime is 42840137. The reversal of 42840135 is 53104824.

It is not a de Polignac number, because 42840135 - 2² = 42840131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42840099 and 42840108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42840131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38649 + ... + 39741.

It is an arithmetic number, because the mean of its divisors is an integer number (1692418).

Almost surely, 2^42840135 is an apocalyptic number.

42840135 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42840135 is a deficient number, since it is larger than the sum of its proper divisors (38395929).

42840135 is a wasteful number, since it uses less digits than its factorization.

42840135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1181 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 42840135 is about 6545.2375816314. The cubic root of 42840135 is about 349.9051035245.

Adding to 42840135 its reverse (53104824), we get a palindrome (95944959).

The spelling of 42840135 in words is "forty-two million, eight hundred forty thousand, one hundred thirty-five".