213636447 has 20 divisors (see below), whose sum is σ = 319691680. Its totient is φ = 142176384.

The previous prime is 213636383. The next prime is 213636473. The reversal of 213636447 is 744636312.

It is a happy number.

213636447 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 3 + 644 + 7 = 666.

It is not a de Polignac number, because 213636447 - 2⁶ = 213636383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213636487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 52554 + ... + 56472.

It is an arithmetic number, because the mean of its divisors is an integer number (15984584).

Almost surely, 2^213636447 is an apocalyptic number.

213636447 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

213636447 is a deficient number, since it is larger than the sum of its proper divisors (106055233).

213636447 is an equidigital number, since it uses as much as digits as its factorization.

213636447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604 (or 4595 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 213636447 is about 14616.3075706555. The cubic root of 213636447 is about 597.8034937462.

It can be divided in two parts, 2136 and 36447, that added together give a palindrome (38583).

The spelling of 213636447 in words is "two hundred thirteen million, six hundred thirty-six thousand, four hundred forty-seven".