42809408 has 28 divisors (see below), whose sum is σ = 85984080. Its totient is φ = 21144192.

The previous prime is 42809363. The next prime is 42809471. The reversal of 42809408 is 80490824.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1283 + ... + 9341.

It is an arithmetic number, because the mean of its divisors is an integer number (3070860).

Almost surely, 2^42809408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42809408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42992040).

42809408 is an abundant number, since it is smaller than the sum of its proper divisors (43174672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42809408 is an equidigital number, since it uses as much as digits as its factorization.

42809408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8154 (or 8144 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 42809408 is about 6542.8898813903. The cubic root of 42809408 is about 349.8214272736.

The spelling of 42809408 in words is "forty-two million, eight hundred nine thousand, four hundred eight".