84840040 has 32 divisors (see below), whose sum is σ = 192276000. Its totient is φ = 33689664.

The previous prime is 84839999. The next prime is 84840043. The reversal of 84840040 is 4004848.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 84839990 and 84840008.

It is not an unprimeable number, because it can be changed into a prime (84840043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2070 + ... + 13189.

It is an arithmetic number, because the mean of its divisors is an integer number (6008625).

Almost surely, 2^84840040 is an apocalyptic number.

It is an amenable number.

84840040 is an abundant number, since it is smaller than the sum of its proper divisors (107435960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84840040 is a wasteful number, since it uses less digits than its factorization.

84840040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15409 (or 15405 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 84840040 is about 9210.8653230845. The cubic root of 84840040 is about 439.4069834814.

Adding to 84840040 its reverse (4004848), we get a palindrome (88844888).

The spelling of 84840040 in words is "eighty-four million, eight hundred forty thousand, forty".