42508839 has 4 divisors (see below), whose sum is σ = 56678456. Its totient is φ = 28339224.

The previous prime is 42508799. The next prime is 42508847. The reversal of 42508839 is 93880524.

42508839 = T₃₀₆₉ + T₃₀₇₀ + ... + T₃₀₇₇.

It is a happy number.

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

It is not a de Polignac number, because 42508839 - 2⁹ = 42508327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42508797 and 42508806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42508859) 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, 7084804 + ... + 7084809.

It is an arithmetic number, because the mean of its divisors is an integer number (14169614).

Almost surely, 2^42508839 is an apocalyptic number.

42508839 is a deficient number, since it is larger than the sum of its proper divisors (14169617).

42508839 is a wasteful number, since it uses less digits than its factorization.

42508839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14169616.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 42508839 is about 6519.8802903121. The cubic root of 42508839 is about 349.0007936425. Note that the first 3 decimals are identical.

The spelling of 42508839 in words is "forty-two million, five hundred eight thousand, eight hundred thirty-nine".