9939890 has 16 divisors (see below), whose sum is σ = 18023040. Its totient is φ = 3946800.

The previous prime is 9939857. The next prime is 9939893. The reversal of 9939890 is 989399.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (9939893) 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, 2186 + ... + 4965.

It is an arithmetic number, because the mean of its divisors is an integer number (1126440).

Almost surely, 2^9939890 is an apocalyptic number.

9939890 is a deficient number, since it is larger than the sum of its proper divisors (8083150).

9939890 is a wasteful number, since it uses less digits than its factorization.

9939890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7297.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 9939890 is about 3152.7591090979. The cubic root of 9939890 is about 215.0109242692.

The spelling of 9939890 in words is "nine million, nine hundred thirty-nine thousand, eight hundred ninety".