215302340 has 24 divisors (see below), whose sum is σ = 493238592. Its totient is φ = 78291680.

The previous prime is 215302277. The next prime is 215302343. The reversal of 215302340 is 43203512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (215302343) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 489104 + ... + 489543.

It is an arithmetic number, because the mean of its divisors is an integer number (20551608).

Almost surely, 2^215302340 is an apocalyptic number.

215302340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215302340 is an abundant number, since it is smaller than the sum of its proper divisors (277936252).

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

215302340 is a wasteful number, since it uses less digits than its factorization.

215302340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978667 (or 978665 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 215302340 is about 14673.1843851292. The cubic root of 215302340 is about 599.3533217811.

Adding to 215302340 its reverse (43203512), we get a palindrome (258505852).

The spelling of 215302340 in words is "two hundred fifteen million, three hundred two thousand, three hundred forty".