42942509 has 8 divisors (see below), whose sum is σ = 44158752. Its totient is φ = 41736240.

The previous prime is 42942481. The next prime is 42942517. The reversal of 42942509 is 90524924.

42942509 = 342² + 343² + ... + 552².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42942509 - 2⁸ = 42942253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42942209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6707 + ... + 11439.

It is an arithmetic number, because the mean of its divisors is an integer number (5519844).

Almost surely, 2^42942509 is an apocalyptic number.

It is an amenable number.

42942509 is a deficient number, since it is larger than the sum of its proper divisors (1216243).

42942509 is a wasteful number, since it uses less digits than its factorization.

42942509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4987.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 42942509 is about 6553.0534104339. The cubic root of 42942509 is about 350.1836016293.

The spelling of 42942509 in words is "forty-two million, nine hundred forty-two thousand, five hundred nine".