42839989 has 8 divisors (see below), whose sum is σ = 44485560. Its totient is φ = 41205696.

The previous prime is 42839987. The next prime is 42839999. The reversal of 42839989 is 98993824.

It can be written as a sum of positive squares in 4 ways, for example, as 13322500 + 29517489 = 3650^2 + 5433^2 .

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 42839989 - 2¹ = 42839987 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 (42839981) 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, 5367 + ... + 10699.

It is an arithmetic number, because the mean of its divisors is an integer number (5560695).

Almost surely, 2^42839989 is an apocalyptic number.

It is an amenable number.

42839989 is a deficient number, since it is larger than the sum of its proper divisors (1645571).

42839989 is a wasteful number, since it uses less digits than its factorization.

42839989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5639.

The product of its digits is 1119744, while the sum is 52.

The square root of 42839989 is about 6545.2264284744. The cubic root of 42839989 is about 349.9047060296.

The spelling of 42839989 in words is "forty-two million, eight hundred thirty-nine thousand, nine hundred eighty-nine".