9898781 has 4 divisors (see below), whose sum is σ = 10046592. Its totient is φ = 9750972.

The previous prime is 9898771. The next prime is 9898783. The reversal of 9898781 is 1878989.

It is a happy number.

9898781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9898781 is a prime.

It is a super-2 number, since 2×9898781² = 195971730571922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9898783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73805 + ... + 73938.

It is an arithmetic number, because the mean of its divisors is an integer number (2511648).

Almost surely, 2^9898781 is an apocalyptic number.

It is an amenable number.

9898781 is a deficient number, since it is larger than the sum of its proper divisors (147811).

9898781 is a wasteful number, since it uses less digits than its factorization.

9898781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147810.

The product of its digits is 290304, while the sum is 50.

The square root of 9898781 is about 3146.2328267310. The cubic root of 9898781 is about 214.7141035019.

The spelling of 9898781 in words is "nine million, eight hundred ninety-eight thousand, seven hundred eighty-one".