215440145 has 8 divisors (see below), whose sum is σ = 272135040. Its totient is φ = 163280880.

The previous prime is 215440129. The next prime is 215440193. The reversal of 215440145 is 541044512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215440145 - 2⁴ = 215440129 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133801 + ... + 1133990.

It is an arithmetic number, because the mean of its divisors is an integer number (34016880).

Almost surely, 2^215440145 is an apocalyptic number.

It is an amenable number.

215440145 is a deficient number, since it is larger than the sum of its proper divisors (56694895).

215440145 is a wasteful number, since it uses less digits than its factorization.

215440145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267815.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 215440145 is about 14677.8794449335. The cubic root of 215440145 is about 599.4811672243.

Adding to 215440145 its reverse (541044512), we get a palindrome (756484657).

The spelling of 215440145 in words is "two hundred fifteen million, four hundred forty thousand, one hundred forty-five".