215397 has 24 divisors (see below), whose sum is σ = 384384. Its totient is φ = 113184.

The previous prime is 215393. The next prime is 215399. The reversal of 215397 is 793512.

215397 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 215397 - 2² = 215393 is a prime.

215397 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 215397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 688 + ... + 950.

It is an arithmetic number, because the mean of its divisors is an integer number (16016).

2²¹⁵³⁹⁷ is an apocalyptic number.

It is an amenable number.

215397 is a deficient number, since it is larger than the sum of its proper divisors (168987).

215397 is a wasteful number, since it uses less digits than its factorization.

215397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 286 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 215397 is about 464.1088234455. The cubic root of 215397 is about 59.9441146299.

The spelling of 215397 in words is "two hundred fifteen thousand, three hundred ninety-seven".