84398981 has 8 divisors (see below), whose sum is σ = 88201344. Its totient is φ = 80680320.

The previous prime is 84398971. The next prime is 84398989. The reversal of 84398981 is 18989348.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84398981 - 2⁶ = 84398917 is a prime.

It is a super-2 number, since 2×84398981² = 14246375987676722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84398989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18860 + ... + 22901.

It is an arithmetic number, because the mean of its divisors is an integer number (11025168).

Almost surely, 2^84398981 is an apocalyptic number.

It is an amenable number.

84398981 is a deficient number, since it is larger than the sum of its proper divisors (3802363).

84398981 is a wasteful number, since it uses less digits than its factorization.

84398981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41851.

The product of its digits is 497664, while the sum is 50.

The square root of 84398981 is about 9186.8918029984. The cubic root of 84398981 is about 438.6442099036.

The spelling of 84398981 in words is "eighty-four million, three hundred ninety-eight thousand, nine hundred eighty-one".