215431450 has 48 divisors (see below), whose sum is σ = 433472256. Its totient is φ = 79185600.

The previous prime is 215431441. The next prime is 215431451. The reversal of 215431450 is 54134512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (215431451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175539 + ... + 176761.

It is an arithmetic number, because the mean of its divisors is an integer number (9030672).

Almost surely, 2^215431450 is an apocalyptic number.

215431450 is an abundant number, since it is smaller than the sum of its proper divisors (218040806).

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

215431450 is a wasteful number, since it uses less digits than its factorization.

215431450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 215431450 is about 14677.5832479329. The cubic root of 215431450 is about 599.4731022482.

Adding to 215431450 its reverse (54134512), we get a palindrome (269565962).

The spelling of 215431450 in words is "two hundred fifteen million, four hundred thirty-one thousand, four hundred fifty".