9724139 has 4 divisors (see below), whose sum is σ = 9743256. Its totient is φ = 9705024.

The previous prime is 9724129. The next prime is 9724151. The reversal of 9724139 is 9314279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9314279 = 13 ⋅716483.

It is a cyclic number.

It is not a de Polignac number, because 9724139 - 2¹² = 9720043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9724099 and 9724108.

It is not an unprimeable number, because it can be changed into a prime (9724129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8774 + ... + 9819.

It is an arithmetic number, because the mean of its divisors is an integer number (2435814).

Almost surely, 2^9724139 is an apocalyptic number.

9724139 is a deficient number, since it is larger than the sum of its proper divisors (19117).

9724139 is a wasteful number, since it uses less digits than its factorization.

9724139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19116.

The product of its digits is 13608, while the sum is 35.

The square root of 9724139 is about 3118.3551754090. The cubic root of 9724139 is about 213.4438861135.

The spelling of 9724139 in words is "nine million, seven hundred twenty-four thousand, one hundred thirty-nine".