9990139 has 4 divisors (see below), whose sum is σ = 9998560. Its totient is φ = 9981720.

The previous prime is 9990137. The next prime is 9990163. The reversal of 9990139 is 9310999.

9990139 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9990139 - 2¹ = 9990137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9990131) 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, 2067 + ... + 4924.

It is an arithmetic number, because the mean of its divisors is an integer number (2499640).

Almost surely, 2^9990139 is an apocalyptic number.

9990139 is a deficient number, since it is larger than the sum of its proper divisors (8421).

9990139 is a wasteful number, since it uses less digits than its factorization.

9990139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8420.

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 9990139 is about 3160.7181146062. The cubic root of 9990139 is about 215.3726294449.

The spelling of 9990139 in words is "nine million, nine hundred ninety thousand, one hundred thirty-nine".