215949 has 4 divisors (see below), whose sum is σ = 287936. Its totient is φ = 143964.

The previous prime is 215939. The next prime is 215953. The reversal of 215949 is 949512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 215949 - 2⁸ = 215693 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35989 + ... + 35994.

It is an arithmetic number, because the mean of its divisors is an integer number (71984).

2²¹⁵⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

215949 is a deficient number, since it is larger than the sum of its proper divisors (71987).

215949 is an equidigital number, since it uses as much as digits as its factorization.

215949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71986.

The product of its digits is 3240, while the sum is 30.

The square root of 215949 is about 464.7031310417. The cubic root of 215949 is about 59.9952774061.

It can be divided in two parts, 2 and 15949, that added together give a palindrome (15951).

The spelling of 215949 in words is "two hundred fifteen thousand, nine hundred forty-nine".