213394897 has 24 divisors (see below), whose sum is σ = 240687720. Its totient is φ = 188474880.

The previous prime is 213394891. The next prime is 213394901. The reversal of 213394897 is 798493312.

It can be written as a sum of positive squares in 4 ways, for example, as 2099601 + 211295296 = 1449^2 + 14536^2 .

It is not a de Polignac number, because 213394897 - 2¹¹ = 213392849 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 (213394891) 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 23 ways as a sum of consecutive naturals, for example, 548379 + ... + 548767.

It is an arithmetic number, because the mean of its divisors is an integer number (10028655).

Almost surely, 2^213394897 is an apocalyptic number.

It is an amenable number.

213394897 is a deficient number, since it is larger than the sum of its proper divisors (27292823).

213394897 is a wasteful number, since it uses less digits than its factorization.

213394897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 490 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 213394897 is about 14608.0422028416. The cubic root of 213394897 is about 597.5781047854.

The spelling of 213394897 in words is "two hundred thirteen million, three hundred ninety-four thousand, eight hundred ninety-seven".