213718729 has 16 divisors (see below), whose sum is σ = 255264768. Its totient is φ = 175108752.

The previous prime is 213718723. The next prime is 213718753. The reversal of 213718729 is 927817312.

It is a happy number.

It is not a de Polignac number, because 213718729 - 2³ = 213718721 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 213718691 and 213718700.

It is not an unprimeable number, because it can be changed into a prime (213718721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6594 + ... + 21700.

It is an arithmetic number, because the mean of its divisors is an integer number (15954048).

Almost surely, 2^213718729 is an apocalyptic number.

It is an amenable number.

213718729 is a deficient number, since it is larger than the sum of its proper divisors (41546039).

213718729 is a wasteful number, since it uses less digits than its factorization.

213718729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15204.

The product of its digits is 42336, while the sum is 40.

The square root of 213718729 is about 14619.1220324615. The cubic root of 213718729 is about 597.8802318280.

The spelling of 213718729 in words is "two hundred thirteen million, seven hundred eighteen thousand, seven hundred twenty-nine".