9913729 has 10 divisors (see below), whose sum is σ = 11568130. Its totient is φ = 8495424.

The previous prime is 9913727. The next prime is 9913733. The reversal of 9913729 is 9273199.

It can be written as a sum of positive squares in only one way, i.e., 8643600 + 1270129 = 2940^2 + 1127^2 .

It is not a de Polignac number, because 9913729 - 2¹ = 9913727 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9913691 and 9913700.

It is not an unprimeable number, because it can be changed into a prime (9913721) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 337 + ... + 4465.

It is an arithmetic number, because the mean of its divisors is an integer number (1156813).

Almost surely, 2^9913729 is an apocalyptic number.

It is an amenable number.

9913729 is a deficient number, since it is larger than the sum of its proper divisors (1654401).

9913729 is an frugal number, since it uses more digits than its factorization.

9913729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157 (or 4136 counting only the distinct ones).

The product of its digits is 30618, while the sum is 40.

The square root of 9913729 is about 3148.6074699778. The cubic root of 9913729 is about 214.8221279886.

The spelling of 9913729 in words is "nine million, nine hundred thirteen thousand, seven hundred twenty-nine".