84399281 has 8 divisors (see below), whose sum is σ = 85328544. Its totient is φ = 83475360.

The previous prime is 84399277. The next prime is 84399299. The reversal of 84399281 is 18299348.

It is a happy number.

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 84399281 - 2² = 84399277 is a prime.

It is a super-2 number, since 2×84399281² = 14246477266633922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84399221) 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, 35861 + ... + 38141.

It is an arithmetic number, because the mean of its divisors is an integer number (10666068).

Almost surely, 2^84399281 is an apocalyptic number.

It is an amenable number.

84399281 is a deficient number, since it is larger than the sum of its proper divisors (929263).

84399281 is a wasteful number, since it uses less digits than its factorization.

84399281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671.

The product of its digits is 124416, while the sum is 44.

The square root of 84399281 is about 9186.9081305954. The cubic root of 84399281 is about 438.6447296299.

The spelling of 84399281 in words is "eighty-four million, three hundred ninety-nine thousand, two hundred eighty-one".