42971776 has 32 divisors (see below), whose sum is σ = 86515380. Its totient is φ = 21258240.

The previous prime is 42971741. The next prime is 42971779. The reversal of 42971776 is 67717924.

It can be written as a sum of positive squares in 2 ways, for example, as 41473600 + 1498176 = 6440^2 + 1224^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (42971779) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10686 + ... + 14146.

Almost surely, 2^42971776 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 42971776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43257690).

42971776 is an abundant number, since it is smaller than the sum of its proper divisors (43543604).

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

42971776 is an equidigital number, since it uses as much as digits as its factorization.

42971776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572 (or 3560 counting only the distinct ones).

The product of its digits is 148176, while the sum is 43.

The square root of 42971776 is about 6555.2861112235. The cubic root of 42971776 is about 350.2631381714.

The spelling of 42971776 in words is "forty-two million, nine hundred seventy-one thousand, seven hundred seventy-six".