215854 has 4 divisors (see below), whose sum is σ = 323784. Its totient is φ = 107926.

The previous prime is 215851. The next prime is 215857. The reversal of 215854 is 458512.

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

It is an interprime number because it is at equal distance from previous prime (215851) and next prime (215857).

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53962 + ... + 53965.

It is an arithmetic number, because the mean of its divisors is an integer number (80946).

2²¹⁵⁸⁵⁴ is an apocalyptic number.

215854 is a deficient number, since it is larger than the sum of its proper divisors (107930).

215854 is a wasteful number, since it uses less digits than its factorization.

215854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107929.

The product of its digits is 1600, while the sum is 25.

The square root of 215854 is about 464.6009040026. The cubic root of 215854 is about 59.9864784345.

The spelling of 215854 in words is "two hundred fifteen thousand, eight hundred fifty-four".