42321987 has 16 divisors (see below), whose sum is σ = 66000000. Its totient is φ = 26729352.

The previous prime is 42321977. The next prime is 42321997. The reversal of 42321987 is 78912324.

It is an interprime number because it is at equal distance from previous prime (42321977) and next prime (42321997).

It is not a de Polignac number, because 42321987 - 2⁷ = 42321859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42321907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40737 + ... + 41762.

It is an arithmetic number, because the mean of its divisors is an integer number (4125000).

Almost surely, 2^42321987 is an apocalyptic number.

42321987 is a deficient number, since it is larger than the sum of its proper divisors (23678013).

42321987 is a wasteful number, since it uses less digits than its factorization.

42321987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82527 (or 82521 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 42321987 is about 6505.5351048165. The cubic root of 42321987 is about 348.4886862016.

The spelling of 42321987 in words is "forty-two million, three hundred twenty-one thousand, nine hundred eighty-seven".