4215540 has 48 divisors (see below), whose sum is σ = 13491072. Its totient is φ = 963456.

The previous prime is 4215539. The next prime is 4215551. The reversal of 4215540 is 455124.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 4599 + ... + 5438.

It is an arithmetic number, because the mean of its divisors is an integer number (281064).

Almost surely, 2^4215540 is an apocalyptic number.

It is an amenable number.

4215540 is an abundant number, since it is smaller than the sum of its proper divisors (9275532).

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

4215540 is a wasteful number, since it uses less digits than its factorization.

4215540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10056 (or 10054 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 4215540 is about 2053.1780244294. The cubic root of 4215540 is about 161.5416092183.

It can be divided in two parts, 42155 and 40, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 4215540 in words is "four million, two hundred fifteen thousand, five hundred forty".