213730993 has 12 divisors (see below), whose sum is σ = 249287220. Its totient is φ = 182710752.

The previous prime is 213730963. The next prime is 213730997. The reversal of 213730993 is 399037312.

It can be written as a sum of positive squares in 2 ways, for example, as 25684624 + 188046369 = 5068^2 + 13713^2 .

It is not a de Polignac number, because 213730993 - 2⁵ = 213730961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213730997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13455 + ... + 24667.

It is an arithmetic number, because the mean of its divisors is an integer number (20773935).

Almost surely, 2^213730993 is an apocalyptic number.

It is an amenable number.

213730993 is a deficient number, since it is larger than the sum of its proper divisors (35556227).

213730993 is a wasteful number, since it uses less digits than its factorization.

213730993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11616 (or 11609 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 213730993 is about 14619.5414770779. The cubic root of 213730993 is about 597.8916678292.

The spelling of 213730993 in words is "two hundred thirteen million, seven hundred thirty thousand, nine hundred ninety-three".