215939 has 2 divisors, whose sum is σ = 215940. Its totient is φ = 215938.

The previous prime is 215927. The next prime is 215953. The reversal of 215939 is 939512.

215939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215939 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 1 + 9⁵ + 5⁷ + 3⁹ + 9⁵ .

It is not a weakly prime, because it can be changed into another prime (215909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107969 + 107970.

It is an arithmetic number, because the mean of its divisors is an integer number (107970).

2²¹⁵⁹³⁹ is an apocalyptic number.

215939 is a deficient number, since it is larger than the sum of its proper divisors (1).

215939 is an equidigital number, since it uses as much as digits as its factorization.

215939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 29.

The square root of 215939 is about 464.6923713598. The cubic root of 215939 is about 59.9943513201.

It can be divided in two parts, 2 and 15939, that multiplied together give a triangular number (31878 = T₂₅₂).

The spelling of 215939 in words is "two hundred fifteen thousand, nine hundred thirty-nine".