9987420 has 24 divisors (see below), whose sum is σ = 27964944. Its totient is φ = 2663296.

The previous prime is 9987413. The next prime is 9987427. The reversal of 9987420 is 247899.

It is an interprime number because it is at equal distance from previous prime (9987413) and next prime (9987427).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83169 + ... + 83288.

It is an arithmetic number, because the mean of its divisors is an integer number (1165206).

Almost surely, 2^9987420 is an apocalyptic number.

It is an amenable number.

9987420 is an abundant number, since it is smaller than the sum of its proper divisors (17977524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9987420 is a wasteful number, since it uses less digits than its factorization.

9987420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166469 (or 166467 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 9987420 is about 3160.2879615630. The cubic root of 9987420 is about 215.3530884650.

The spelling of 9987420 in words is "nine million, nine hundred eighty-seven thousand, four hundred twenty".