215315420 has 48 divisors (see below), whose sum is σ = 474163200. Its totient is φ = 81973056.

The previous prime is 215315417. The next prime is 215315431. The reversal of 215315420 is 24513512.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101531 + ... + 103629.

It is an arithmetic number, because the mean of its divisors is an integer number (9878400).

Almost surely, 2^215315420 is an apocalyptic number.

215315420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215315420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237081600).

215315420 is an abundant number, since it is smaller than the sum of its proper divisors (258847780).

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

215315420 is a wasteful number, since it uses less digits than its factorization.

215315420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354 (or 2352 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 215315420 is about 14673.6300893814. The cubic root of 215315420 is about 599.3654587953.

Adding to 215315420 its reverse (24513512), we get a palindrome (239828932).

The spelling of 215315420 in words is "two hundred fifteen million, three hundred fifteen thousand, four hundred twenty".