9947639 has 4 divisors (see below), whose sum is σ = 10712856. Its totient is φ = 9182424.

The previous prime is 9947627. The next prime is 9947653. The reversal of 9947639 is 9367499.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9947639 - 2⁸ = 9947383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9947593 and 9947602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9947039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382589 + ... + 382614.

It is an arithmetic number, because the mean of its divisors is an integer number (2678214).

Almost surely, 2^9947639 is an apocalyptic number.

9947639 is a deficient number, since it is larger than the sum of its proper divisors (765217).

9947639 is a wasteful number, since it uses less digits than its factorization.

9947639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765216.

The product of its digits is 367416, while the sum is 47.

The square root of 9947639 is about 3153.9877932548. The cubic root of 9947639 is about 215.0667829315.

The spelling of 9947639 in words is "nine million, nine hundred forty-seven thousand, six hundred thirty-nine".