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987840 = 2632573

987840 has 168 divisors, whose sum is σ = 3962400. Its totient is φ = 225792.

The previous prime is 987821. The next prime is 987851. The reversal of 987840 is 48789.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 987795 and 987804.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 987840.

It is an unprimeable number.

987840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141117 + ... + 141123.

2987840 is an apocalyptic number.

987840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 987840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1981200).

987840 is an abundant number, since it is smaller than the sum of its proper divisors (2974560).

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

987840 is a wasteful number, since it uses less digits than its factorization.

987840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 987840 is about 993.9014035607. The cubic root of 987840 is about 99.5930125257.

The spelling of 987840 in words is "nine hundred eighty-seven thousand, eight hundred forty".