42939680 has 72 divisors (see below), whose sum is σ = 118028988. Its totient is φ = 14719488.

The previous prime is 42939667. The next prime is 42939703. The reversal of 42939680 is 8693924.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 38987536 + 3952144 = 6244^2 + 1988^2 .

It is a super-2 number, since 2×42939680² = 3687632237004800, which contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5102 + ... + 10578.

Almost surely, 2^42939680 is an apocalyptic number.

42939680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42939680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59014494).

42939680 is an abundant number, since it is smaller than the sum of its proper divisors (75089308).

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

42939680 is a wasteful number, since it uses less digits than its factorization.

42939680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506 (or 5491 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 42939680 is about 6552.8375533047. The cubic root of 42939680 is about 350.1759115712.

The spelling of 42939680 in words is "forty-two million, nine hundred thirty-nine thousand, six hundred eighty".