215447 has 2 divisors, whose sum is σ = 215448. Its totient is φ = 215446.

The previous prime is 215443. The next prime is 215459. The reversal of 215447 is 744512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215447 - 2² = 215443 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107723 + 107724.

It is an arithmetic number, because the mean of its divisors is an integer number (107724).

2²¹⁵⁴⁴⁷ is an apocalyptic number.

215447 is a deficient number, since it is larger than the sum of its proper divisors (1).

215447 is an equidigital number, since it uses as much as digits as its factorization.

215447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 23.

The square root of 215447 is about 464.1626869967. The cubic root of 215447 is about 59.9487525371.

Adding to 215447 its reverse (744512), we get a palindrome (959959).

The spelling of 215447 in words is "two hundred fifteen thousand, four hundred forty-seven".