215340623 has 4 divisors (see below), whose sum is σ = 226674360. Its totient is φ = 204006888.

The previous prime is 215340617. The next prime is 215340637. The reversal of 215340623 is 326043512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215340623 - 2²⁰ = 214292047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215340592 and 215340601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215340523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5666840 + ... + 5666877.

It is an arithmetic number, because the mean of its divisors is an integer number (56668590).

Almost surely, 2^215340623 is an apocalyptic number.

215340623 is a deficient number, since it is larger than the sum of its proper divisors (11333737).

215340623 is a wasteful number, since it uses less digits than its factorization.

215340623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11333736.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 215340623 is about 14674.4888497010. The cubic root of 215340623 is about 599.3888434315.

The spelling of 215340623 in words is "two hundred fifteen million, three hundred forty thousand, six hundred twenty-three".