42809519 has 8 divisors (see below), whose sum is σ = 45496368. Its totient is φ = 40141440.

The previous prime is 42809497. The next prime is 42809537. The reversal of 42809519 is 91590824.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42809519 is a prime.

It is a super-2 number, since 2×42809519² = 3665309834022722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42809219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164 + ... + 9254.

It is an arithmetic number, because the mean of its divisors is an integer number (5687046).

Almost surely, 2^42809519 is an apocalyptic number.

42809519 is a deficient number, since it is larger than the sum of its proper divisors (2686849).

42809519 is a wasteful number, since it uses less digits than its factorization.

42809519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9385.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 42809519 is about 6542.8983638751. The cubic root of 42809519 is about 349.8217296226.

The spelling of 42809519 in words is "forty-two million, eight hundred nine thousand, five hundred nineteen".