9428139 has 18 divisors (see below), whose sum is σ = 15842580. Its totient is φ = 5387256.

The previous prime is 9428131. The next prime is 9428143. The reversal of 9428139 is 9318249.

It is not a de Polignac number, because 9428139 - 2³ = 9428131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9428131) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10249 + ... + 11130.

Almost surely, 2^9428139 is an apocalyptic number.

9428139 is a deficient number, since it is larger than the sum of its proper divisors (6414441).

9428139 is a wasteful number, since it uses less digits than its factorization.

9428139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21399 (or 21389 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 9428139 is about 3070.5274791149. The cubic root of 9428139 is about 211.2558085771.

The spelling of 9428139 in words is "nine million, four hundred twenty-eight thousand, one hundred thirty-nine".