215429220 has 144 divisors (see below), whose sum is σ = 713643840. Its totient is φ = 54400896.

The previous prime is 215429213. The next prime is 215429257. The reversal of 215429220 is 22924512.

It is a happy number.

215429220 is a `hidden beast` number, since 2 + 15 + 429 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 47 ways as a sum of consecutive naturals, for example, 91174 + ... + 93506.

It is an arithmetic number, because the mean of its divisors is an integer number (4955860).

Almost surely, 2^215429220 is an apocalyptic number.

215429220 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 215429220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356821920).

215429220 is an abundant number, since it is smaller than the sum of its proper divisors (498214620).

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

215429220 is a wasteful number, since it uses less digits than its factorization.

215429220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376 (or 2362 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 215429220 is about 14677.5072815516. The cubic root of 215429220 is about 599.4710337950.

The spelling of 215429220 in words is "two hundred fifteen million, four hundred twenty-nine thousand, two hundred twenty".