42987992 has 8 divisors (see below), whose sum is σ = 80602500. Its totient is φ = 21493992.

The previous prime is 42987953. The next prime is 42988007. The reversal of 42987992 is 29978924.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 42987992.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2686742 + ... + 2686757.

Almost surely, 2^42987992 is an apocalyptic number.

It is an amenable number.

42987992 is a deficient number, since it is larger than the sum of its proper divisors (37614508).

42987992 is a wasteful number, since it uses less digits than its factorization.

42987992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5373505 (or 5373501 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 42987992 is about 6556.5228589550. The cubic root of 42987992 is about 350.3071915267.

It can be divided in two parts, 4298 and 7992, that multiplied together give a triangular number (34349616 = T₈₂₈₈).

The spelling of 42987992 in words is "forty-two million, nine hundred eighty-seven thousand, nine hundred ninety-two".