215246420 has 24 divisors (see below), whose sum is σ = 471671424. Its totient is φ = 82354976.

The previous prime is 215246419. The next prime is 215246477. The reversal of 215246420 is 24642512.

It is a self number, because there is not a number n which added to its sum of digits gives 215246420.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233504 + ... + 234423.

It is an arithmetic number, because the mean of its divisors is an integer number (19652976).

Almost surely, 2^215246420 is an apocalyptic number.

215246420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215246420 is an abundant number, since it is smaller than the sum of its proper divisors (256425004).

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

215246420 is a wasteful number, since it uses less digits than its factorization.

215246420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467959 (or 467957 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 215246420 is about 14671.2787445403. The cubic root of 215246420 is about 599.3014277177.

Adding to 215246420 its reverse (24642512), we get a palindrome (239888932).

The spelling of 215246420 in words is "two hundred fifteen million, two hundred forty-six thousand, four hundred twenty".