215140347 has 16 divisors (see below), whose sum is σ = 319658880. Its totient is φ = 143007336.

The previous prime is 215140333. The next prime is 215140379. The reversal of 215140347 is 743041512.

215140347 is a `hidden beast` number, since 215 + 1 + 403 + 47 = 666.

It is not a de Polignac number, because 215140347 - 2¹¹ = 215138299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 215140347.

It is not an unprimeable number, because it can be changed into a prime (215140307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2113 + ... + 20850.

It is an arithmetic number, because the mean of its divisors is an integer number (19978680).

Almost surely, 2^215140347 is an apocalyptic number.

215140347 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

215140347 is a deficient number, since it is larger than the sum of its proper divisors (104518533).

215140347 is a wasteful number, since it uses less digits than its factorization.

215140347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23319 (or 23313 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 215140347 is about 14667.6633108345. The cubic root of 215140347 is about 599.2029666987.

Adding to 215140347 its reverse (743041512), we get a palindrome (958181859).

The spelling of 215140347 in words is "two hundred fifteen million, one hundred forty thousand, three hundred forty-seven".