9801840 has 40 divisors (see below), whose sum is σ = 30386448. Its totient is φ = 2613760.

The previous prime is 9801839. The next prime is 9801851. The reversal of 9801840 is 481089.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 9801798 and 9801807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20181 + ... + 20660.

Almost surely, 2^9801840 is an apocalyptic number.

It is an amenable number.

9801840 is an abundant number, since it is smaller than the sum of its proper divisors (20584608).

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

9801840 is a wasteful number, since it uses less digits than its factorization.

9801840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40857 (or 40851 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 9801840 is about 3130.7890379264. The cubic root of 9801840 is about 214.0108883155.

The spelling of 9801840 in words is "nine million, eight hundred one thousand, eight hundred forty".