42987771 has 24 divisors (see below), whose sum is σ = 63598080. Its totient is φ = 27973296.

The previous prime is 42987761. The next prime is 42987779. The reversal of 42987771 is 17778924.

It is a happy number.

It is not a de Polignac number, because 42987771 - 2⁵ = 42987739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42987779) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 72940 + ... + 73526.

It is an arithmetic number, because the mean of its divisors is an integer number (2649920).

Almost surely, 2^42987771 is an apocalyptic number.

42987771 is a deficient number, since it is larger than the sum of its proper divisors (20610309).

42987771 is a wasteful number, since it uses less digits than its factorization.

42987771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775 (or 772 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 42987771 is about 6556.5060054880. The cubic root of 42987771 is about 350.3065912193.

The spelling of 42987771 in words is "forty-two million, nine hundred eighty-seven thousand, seven hundred seventy-one".