8400081 has 16 divisors (see below), whose sum is σ = 11491200. Its totient is φ = 5456640.

The previous prime is 8400079. The next prime is 8400097. The reversal of 8400081 is 1800048.

It is not a de Polignac number, because 8400081 - 2¹ = 8400079 is a prime.

It is a super-2 number, since 2×8400081² = 141122721613122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8400011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23895 + ... + 24243.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^8400081 is an apocalyptic number.

It is an amenable number.

8400081 is a deficient number, since it is larger than the sum of its proper divisors (3091119).

8400081 is a wasteful number, since it uses less digits than its factorization.

8400081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 8400081 is about 2898.2893230318. The cubic root of 8400081 is about 203.2799247585.

The spelling of 8400081 in words is "eight million, four hundred thousand, eighty-one".