215243434 has 16 divisors (see below), whose sum is σ = 369851328. Its totient is φ = 92031552.

The previous prime is 215243429. The next prime is 215243437. The reversal of 215243434 is 434342512.

It is a happy number.

215243434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215243434² = 92659471760224712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215243437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11692 + ... + 23815.

It is an arithmetic number, because the mean of its divisors is an integer number (23115708).

Almost surely, 2^215243434 is an apocalyptic number.

215243434 is a deficient number, since it is larger than the sum of its proper divisors (154607894).

215243434 is a wasteful number, since it uses less digits than its factorization.

215243434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35949.

The product of its digits is 11520, while the sum is 28.

The square root of 215243434 is about 14671.1769807333. The cubic root of 215243434 is about 599.2986564407.

Adding to 215243434 its reverse (434342512), we get a palindrome (649585946).

The spelling of 215243434 in words is "two hundred fifteen million, two hundred forty-three thousand, four hundred thirty-four".