12009890 has 8 divisors (see below), whose sum is σ = 21617820. Its totient is φ = 4803952.

The previous prime is 12009869. The next prime is 12009901. The reversal of 12009890 is 9890021.

It can be written as a sum of positive squares in 2 ways, for example, as 11909401 + 100489 = 3451^2 + 317^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600485 + ... + 600504.

Almost surely, 2^12009890 is an apocalyptic number.

12009890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12009890 is a deficient number, since it is larger than the sum of its proper divisors (9607930).

12009890 is a wasteful number, since it uses less digits than its factorization.

12009890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200996.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 12009890 is about 3465.5288196753. The cubic root of 12009890 is about 229.0057269278.

The spelling of 12009890 in words is "twelve million, nine thousand, eight hundred ninety".