9881387 has 4 divisors (see below), whose sum is σ = 10401480. Its totient is φ = 9361296.

The previous prime is 9881381. The next prime is 9881401. The reversal of 9881387 is 7831889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7831889 = 13 ⋅602453.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9881387 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9881381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260018 + ... + 260055.

It is an arithmetic number, because the mean of its divisors is an integer number (2600370).

Almost surely, 2^9881387 is an apocalyptic number.

9881387 is a deficient number, since it is larger than the sum of its proper divisors (520093).

9881387 is a wasteful number, since it uses less digits than its factorization.

9881387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520092.

The product of its digits is 96768, while the sum is 44.

The square root of 9881387 is about 3143.4673530991. The cubic root of 9881387 is about 214.5882655562.

It can be divided in two parts, 98813 and 87, that multiplied together give a triangular number (8596731 = T₄₁₄₆).

The spelling of 9881387 in words is "nine million, eight hundred eighty-one thousand, three hundred eighty-seven".