84009213 has 6 divisors (see below), whose sum is σ = 121346654. Its totient is φ = 56006136.

The previous prime is 84009209. The next prime is 84009221. The reversal of 84009213 is 31290048.

It can be written as a sum of positive squares in only one way, i.e., 75116889 + 8892324 = 8667^2 + 2982^2 .

It is not a de Polignac number, because 84009213 - 2² = 84009209 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 (84001213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4667170 + ... + 4667187.

Almost surely, 2^84009213 is an apocalyptic number.

It is an amenable number.

84009213 is a deficient number, since it is larger than the sum of its proper divisors (37337441).

84009213 is a wasteful number, since it uses less digits than its factorization.

84009213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9334363 (or 9334360 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 84009213 is about 9165.6539864867. The cubic root of 84009213 is about 437.9679247169.

The spelling of 84009213 in words is "eighty-four million, nine thousand, two hundred thirteen".