42505383987 has 40 divisors (see below), whose sum is σ = 72913748160. Its totient is φ = 24404995440.

The previous prime is 42505383967. The next prime is 42505384027. The reversal of 42505383987 is 78938350524.

42505383987 is a `hidden beast` number, since 4 + 25 + 0 + 538 + 3 + 9 + 87 = 666.

It is not a de Polignac number, because 42505383987 - 2⁷ = 42505383859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42505383967) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1238473 + ... + 1272330.

It is an arithmetic number, because the mean of its divisors is an integer number (1822843704).

Almost surely, 2^42505383987 is an apocalyptic number.

42505383987 is a deficient number, since it is larger than the sum of its proper divisors (30408364173).

42505383987 is a wasteful number, since it uses less digits than its factorization.

42505383987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510845 (or 2510836 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 42505383987 in words is "forty-two billion, five hundred five million, three hundred eighty-three thousand, nine hundred eighty-seven".