9987390 has 96 divisors (see below), whose sum is σ = 30191616. Its totient is φ = 2243520.

The previous prime is 9987389. The next prime is 9987391. The reversal of 9987390 is 937899.

It is a happy number.

9987390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9987389) and next prime (9987391).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52195 + ... + 52385.

It is an arithmetic number, because the mean of its divisors is an integer number (314496).

Almost surely, 2^9987390 is an apocalyptic number.

9987390 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9987390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15095808).

9987390 is an abundant number, since it is smaller than the sum of its proper divisors (20204226).

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

9987390 is a wasteful number, since it uses less digits than its factorization.

9987390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 9987390 is about 3160.2832151565. The cubic root of 9987390 is about 215.3528728405.

The spelling of 9987390 in words is "nine million, nine hundred eighty-seven thousand, three hundred ninety".