9138021 has 8 divisors (see below), whose sum is σ = 12266400. Its totient is φ = 6050832.

The previous prime is 9138007. The next prime is 9138029. The reversal of 9138021 is 1208319.

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

It is not a de Polignac number, because 9138021 - 2⁷ = 9137893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9137982 and 9138000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9138029) 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, 9775 + ... + 10668.

It is an arithmetic number, because the mean of its divisors is an integer number (1533300).

Almost surely, 2^9138021 is an apocalyptic number.

It is an amenable number.

9138021 is a deficient number, since it is larger than the sum of its proper divisors (3128379).

9138021 is a wasteful number, since it uses less digits than its factorization.

9138021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20595.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 9138021 is about 3022.9159763381. The cubic root of 9138021 is about 209.0663083333.

The spelling of 9138021 in words is "nine million, one hundred thirty-eight thousand, twenty-one".