42318909 has 16 divisors (see below), whose sum is σ = 65995200. Its totient is φ = 26727408.

The previous prime is 42318907. The next prime is 42318943. The reversal of 42318909 is 90981324.

It is not a de Polignac number, because 42318909 - 2¹ = 42318907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42318901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40734 + ... + 41759.

It is an arithmetic number, because the mean of its divisors is an integer number (4124700).

Almost surely, 2^42318909 is an apocalyptic number.

It is an amenable number.

42318909 is a deficient number, since it is larger than the sum of its proper divisors (23676291).

42318909 is a wasteful number, since it uses less digits than its factorization.

42318909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82521 (or 82515 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 42318909 is about 6505.2985327347. The cubic root of 42318909 is about 348.4802376838.

The spelling of 42318909 in words is "forty-two million, three hundred eighteen thousand, nine hundred nine".