215138294 has 8 divisors (see below), whose sum is σ = 368808528. Its totient is φ = 92202120.

The previous prime is 215138291. The next prime is 215138299. The reversal of 215138294 is 492831512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215138291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7683497 + ... + 7683524.

It is an arithmetic number, because the mean of its divisors is an integer number (46101066).

Almost surely, 2^215138294 is an apocalyptic number.

215138294 is a deficient number, since it is larger than the sum of its proper divisors (153670234).

215138294 is a wasteful number, since it uses less digits than its factorization.

215138294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15367030.

The product of its digits is 17280, while the sum is 35.

The square root of 215138294 is about 14667.5933267868. The cubic root of 215138294 is about 599.2010607063.

It can be divided in two parts, 21 and 5138294, that added together give a palindrome (5138315).

The spelling of 215138294 in words is "two hundred fifteen million, one hundred thirty-eight thousand, two hundred ninety-four".