215730142 has 16 divisors (see below), whose sum is σ = 344005200. Its totient is φ = 101174400.

The previous prime is 215730139. The next prime is 215730149. The reversal of 215730142 is 241037512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215730149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24267 + ... + 31942.

It is an arithmetic number, because the mean of its divisors is an integer number (21500325).

Almost surely, 2^215730142 is an apocalyptic number.

215730142 is a deficient number, since it is larger than the sum of its proper divisors (128275058).

215730142 is a wasteful number, since it uses less digits than its factorization.

215730142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56331.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 215730142 is about 14687.7548318319. The cubic root of 215730142 is about 599.7500273521.

Adding to 215730142 its reverse (241037512), we get a palindrome (456767654).

The spelling of 215730142 in words is "two hundred fifteen million, seven hundred thirty thousand, one hundred forty-two".