42135207 has 4 divisors (see below), whose sum is σ = 56180280. Its totient is φ = 28090136.

The previous prime is 42135187. The next prime is 42135211. The reversal of 42135207 is 70253124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42135207 - 2⁶ = 42135143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42135257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7022532 + ... + 7022537.

It is an arithmetic number, because the mean of its divisors is an integer number (14045070).

Almost surely, 2^42135207 is an apocalyptic number.

42135207 is a deficient number, since it is larger than the sum of its proper divisors (14045073).

42135207 is a wasteful number, since it uses less digits than its factorization.

42135207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14045072.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 42135207 is about 6491.1637631476. The cubic root of 42135207 is about 347.9752674324.

It can be divided in two parts, 4 and 2135207, that added together give a triangular number (2135211 = T₂₀₆₆).

The spelling of 42135207 in words is "forty-two million, one hundred thirty-five thousand, two hundred seven".