1987467993 has 24 divisors (see below), whose sum is σ = 3282135168. Its totient is φ = 1135268352.

The previous prime is 1987467983. The next prime is 1987468003. The reversal of 1987467993 is 3997647891.

1987467993 is a `hidden beast` number, since 1 + 9 + 87 + 467 + 9 + 93 = 666.

It is an interprime number because it is at equal distance from previous prime (1987467983) and next prime (1987468003).

It is not a de Polignac number, because 1987467993 - 2⁹ = 1987467481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 1987467993.

It is not an unprimeable number, because it can be changed into a prime (1987467983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248505 + ... + 256377.

It is an arithmetic number, because the mean of its divisors is an integer number (136755632).

Almost surely, 2^1987467993 is an apocalyptic number.

It is an amenable number.

1987467993 is a deficient number, since it is larger than the sum of its proper divisors (1294667175).

1987467993 is a wasteful number, since it uses less digits than its factorization.

1987467993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11893 (or 11890 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 1987467993 is about 44581.0272761856. The cubic root of 1987467993 is about 1257.2839776638.

The spelling of 1987467993 in words is "one billion, nine hundred eighty-seven million, four hundred sixty-seven thousand, nine hundred ninety-three".