84512440 has 64 divisors (see below), whose sum is σ = 206841600. Its totient is φ = 30947328.

The previous prime is 84512429. The next prime is 84512459. The reversal of 84512440 is 4421548.

It is a junction number, because it is equal to n+sod(n) for n = 84512399 and 84512408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23481 + ... + 26839.

It is an arithmetic number, because the mean of its divisors is an integer number (3231900).

Almost surely, 2^84512440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84512440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103420800).

84512440 is an abundant number, since it is smaller than the sum of its proper divisors (122329160).

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

84512440 is a wasteful number, since it uses less digits than its factorization.

84512440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424 (or 3420 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 84512440 is about 9193.0647773199. The cubic root of 84512440 is about 438.8406808723.

Adding to 84512440 its reverse (4421548), we get a palindrome (88933988).

The spelling of 84512440 in words is "eighty-four million, five hundred twelve thousand, four hundred forty".