215240355 has 64 divisors (see below), whose sum is σ = 420157440. Its totient is φ = 103680000.

The previous prime is 215240351. The next prime is 215240369. The reversal of 215240355 is 553042512.

It is a happy number.

215240355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215240355 - 2² = 215240351 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (215240351) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 286230 + ... + 286980.

It is an arithmetic number, because the mean of its divisors is an integer number (6564960).

Almost surely, 2^215240355 is an apocalyptic number.

215240355 is a deficient number, since it is larger than the sum of its proper divisors (204917085).

215240355 is a wasteful number, since it uses less digits than its factorization.

215240355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 215240355 is about 14671.0720467183. The cubic root of 215240355 is about 599.2957988245.

Adding to 215240355 its reverse (553042512), we get a palindrome (768282867).

The spelling of 215240355 in words is "two hundred fifteen million, two hundred forty thousand, three hundred fifty-five".