215404430 has 32 divisors (see below), whose sum is σ = 417650688. Its totient is φ = 79754400.

The previous prime is 215404403. The next prime is 215404477. The reversal of 215404430 is 34404512.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a junction number, because it is equal to n+sod(n) for n = 215404396 and 215404405.

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, 7976 + ... + 22235.

It is an arithmetic number, because the mean of its divisors is an integer number (13051584).

Almost surely, 2^215404430 is an apocalyptic number.

215404430 is a deficient number, since it is larger than the sum of its proper divisors (202246258).

215404430 is a wasteful number, since it uses less digits than its factorization.

215404430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30272.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 215404430 is about 14676.6627678093. The cubic root of 215404430 is about 599.4480386832.

Adding to 215404430 its reverse (34404512), we get a palindrome (249808942).

The spelling of 215404430 in words is "two hundred fifteen million, four hundred four thousand, four hundred thirty".