84400081 has 4 divisors (see below), whose sum is σ = 84548464. Its totient is φ = 84251700.

The previous prime is 84400067. The next prime is 84400093. The reversal of 84400081 is 18000448.

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 not a de Polignac number, because 84400081 - 2⁵ = 84400049 is a prime.

It is a super-2 number, since 2×84400081² = 14246747345613122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84400021) 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, 73335 + ... + 74476.

It is an arithmetic number, because the mean of its divisors is an integer number (21137116).

Almost surely, 2^84400081 is an apocalyptic number.

It is an amenable number.

84400081 is a deficient number, since it is larger than the sum of its proper divisors (148383).

84400081 is a wasteful number, since it uses less digits than its factorization.

84400081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148382.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 84400081 is about 9186.9516707121. The cubic root of 84400081 is about 438.6461155606.

The spelling of 84400081 in words is "eighty-four million, four hundred thousand, eighty-one".