9921490 has 16 divisors (see below), whose sum is σ = 17898048. Its totient is φ = 3959856.

The previous prime is 9921479. The next prime is 9921491. The reversal of 9921490 is 941299.

It is not an unprimeable number, because it can be changed into a prime (9921491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5659 + ... + 7201.

It is an arithmetic number, because the mean of its divisors is an integer number (1118628).

Almost surely, 2^9921490 is an apocalyptic number.

9921490 is the 2572-nd pentagonal number.

9921490 is a deficient number, since it is larger than the sum of its proper divisors (7976558).

9921490 is a wasteful number, since it uses less digits than its factorization.

9921490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 9921490 is about 3149.8396784598. The cubic root of 9921490 is about 214.8781714699.

The spelling of 9921490 in words is "nine million, nine hundred twenty-one thousand, four hundred ninety".