215893 has 2 divisors, whose sum is σ = 215894. Its totient is φ = 215892.

The previous prime is 215863. The next prime is 215899. The reversal of 215893 is 398512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161604 + 54289 = 402^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 215893 - 2⁹ = 215381 is a prime.

215893 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107946 + 107947.

It is an arithmetic number, because the mean of its divisors is an integer number (107947).

2²¹⁵⁸⁹³ is an apocalyptic number.

It is an amenable number.

215893 is a deficient number, since it is larger than the sum of its proper divisors (1).

215893 is an equidigital number, since it uses as much as digits as its factorization.

215893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 215893 is about 464.6428736137. The cubic root of 215893 is about 59.9900909562.

It can be divided in two parts, 21 and 5893, that multiplied together give a triangular number (123753 = T₄₉₇).

The spelling of 215893 in words is "two hundred fifteen thousand, eight hundred ninety-three".