42991288 has 16 divisors (see below), whose sum is σ = 82575360. Its totient is φ = 20971200.

The previous prime is 42991279. The next prime is 42991297. The reversal of 42991288 is 88219924.

It is an interprime number because it is at equal distance from previous prime (42991279) and next prime (42991297).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65208 + ... + 65863.

It is an arithmetic number, because the mean of its divisors is an integer number (5160960).

Almost surely, 2^42991288 is an apocalyptic number.

It is an amenable number.

42991288 is a deficient number, since it is larger than the sum of its proper divisors (39584072).

42991288 is a wasteful number, since it uses less digits than its factorization.

42991288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131118 (or 131114 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 42991288 is about 6556.7742068795. The cubic root of 42991288 is about 350.3161442825.

The spelling of 42991288 in words is "forty-two million, nine hundred ninety-one thousand, two hundred eighty-eight".