9890881 has 32 divisors (see below), whose sum is σ = 13660416. Its totient is φ = 6912000.

The previous prime is 9890873. The next prime is 9890899. The reversal of 9890881 is 1880989.

9890881 = 173² + 174² + ... + 326².

It is a 3-Lehmer number, since φ(9890881) divides (9890881-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 9890881 - 2³ = 9890873 is a prime.

It is a super-2 number, since 2×9890881² = 195659053912322, which contains 22 as substring.

It is a deceptive number, since it divides R_9890880.

9890881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9890081) 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 31 ways as a sum of consecutive naturals, for example, 40921 + ... + 41161.

It is an arithmetic number, because the mean of its divisors is an integer number (426888).

It is a Poulet number, since it divides 2^9890880-1.

Almost surely, 2^9890881 is an apocalyptic number.

9890881 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

9890881 is a deficient number, since it is larger than the sum of its proper divisors (3769535).

9890881 is a wasteful number, since it uses less digits than its factorization.

9890881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313.

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 9890881 is about 3144.9771064350. The cubic root of 9890881 is about 214.6569687610.

It can be divided in two parts, 98908 and 81, that added together give a palindrome (98989).

The spelling of 9890881 in words is "nine million, eight hundred ninety thousand, eight hundred eighty-one".