8400540 has 24 divisors (see below), whose sum is σ = 23521680. Its totient is φ = 2240128.

The previous prime is 8400529. The next prime is 8400563. The reversal of 8400540 is 450048.

8400540 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69945 + ... + 70064.

It is an arithmetic number, because the mean of its divisors is an integer number (980070).

Almost surely, 2^8400540 is an apocalyptic number.

It is an amenable number.

8400540 is an abundant number, since it is smaller than the sum of its proper divisors (15121140).

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

8400540 is a wasteful number, since it uses less digits than its factorization.

8400540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140021 (or 140019 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 8400540 is about 2898.3685065913. The cubic root of 8400540 is about 203.2836272540.

Adding to 8400540 its reverse (450048), we get a palindrome (8850588).

The spelling of 8400540 in words is "eight million, four hundred thousand, five hundred forty".