12918890 has 16 divisors (see below), whose sum is σ = 23749632. Its totient is φ = 5057424.

The previous prime is 12918889. The next prime is 12918901. The reversal of 12918890 is 9881921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13274 + ... + 14213.

It is an arithmetic number, because the mean of its divisors is an integer number (1484352).

Almost surely, 2^12918890 is an apocalyptic number.

12918890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12918890 is a deficient number, since it is larger than the sum of its proper divisors (10830742).

12918890 is a wasteful number, since it uses less digits than its factorization.

12918890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27541.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 12918890 is about 3594.2857426754. The cubic root of 12918890 is about 234.6434308770.

The spelling of 12918890 in words is "twelve million, nine hundred eighteen thousand, eight hundred ninety".