209712993 has 12 divisors (see below), whose sum is σ = 325269360. Its totient is φ = 119835912.

The previous prime is 209712977. The next prime is 209713019. The reversal of 209712993 is 399217902.

It is a happy number.

It is not a de Polignac number, because 209712993 - 2⁴ = 209712977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209712953) 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 11 ways as a sum of consecutive naturals, for example, 713163 + ... + 713456.

It is an arithmetic number, because the mean of its divisors is an integer number (27105780).

Almost surely, 2^209712993 is an apocalyptic number.

It is an amenable number.

209712993 is a deficient number, since it is larger than the sum of its proper divisors (115556367).

209712993 is a wasteful number, since it uses less digits than its factorization.

209712993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426636 (or 1426629 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 209712993 is about 14481.4706780769. The cubic root of 209712993 is about 594.1212865507.

The spelling of 209712993 in words is "two hundred nine million, seven hundred twelve thousand, nine hundred ninety-three".