215740867 has 2 divisors, whose sum is σ = 215740868. Its totient is φ = 215740866.

The previous prime is 215740849. The next prime is 215740879. The reversal of 215740867 is 768047512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215740867 - 2⁷ = 215740739 is a prime.

It is not a weakly prime, because it can be changed into another prime (215140867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107870433 + 107870434.

It is an arithmetic number, because the mean of its divisors is an integer number (107870434).

Almost surely, 2^215740867 is an apocalyptic number.

215740867 is a deficient number, since it is larger than the sum of its proper divisors (1).

215740867 is an equidigital number, since it uses as much as digits as its factorization.

215740867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 215740867 is about 14688.1199273426. The cubic root of 215740867 is about 599.7599660227.

The spelling of 215740867 in words is "two hundred fifteen million, seven hundred forty thousand, eight hundred sixty-seven".