215042340 has 48 divisors (see below), whose sum is σ = 602961408. Its totient is φ = 57264384.

The previous prime is 215042291. The next prime is 215042351. The reversal of 215042340 is 43240512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49704 + ... + 53856.

It is an arithmetic number, because the mean of its divisors is an integer number (12561696).

Almost surely, 2^215042340 is an apocalyptic number.

215042340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215042340 is an abundant number, since it is smaller than the sum of its proper divisors (387919068).

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

215042340 is a wasteful number, since it uses less digits than its factorization.

215042340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028 (or 5026 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 215042340 is about 14664.3220095578. The cubic root of 215042340 is about 599.1119640799. Note that the first 3 decimals are identical.

Adding to 215042340 its reverse (43240512), we get a palindrome (258282852).

The spelling of 215042340 in words is "two hundred fifteen million, forty-two thousand, three hundred forty".