9947139 has 8 divisors (see below), whose sum is σ = 13278912. Its totient is φ = 6623400.

The previous prime is 9947131. The next prime is 9947141. The reversal of 9947139 is 9317499.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9947139 - 2³ = 9947131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9947139.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9947131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2064 + ... + 4914.

It is an arithmetic number, because the mean of its divisors is an integer number (1659864).

Almost surely, 2^9947139 is an apocalyptic number.

9947139 is a deficient number, since it is larger than the sum of its proper divisors (3331773).

9947139 is a wasteful number, since it uses less digits than its factorization.

9947139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017.

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

The square root of 9947139 is about 3153.9085275258. The cubic root of 9947139 is about 215.0631795575.

The spelling of 9947139 in words is "nine million, nine hundred forty-seven thousand, one hundred thirty-nine".