12239890 has 16 divisors (see below), whose sum is σ = 23726808. Its totient is φ = 4519296.

The previous prime is 12239869. The next prime is 12239897. The reversal of 12239890 is 9893221.

It can be written as a sum of positive squares in 4 ways, for example, as 7027801 + 5212089 = 2651^2 + 2283^2 .

It is not an unprimeable number, because it can be changed into a prime (12239897) 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, 46947 + ... + 47206.

Almost surely, 2^12239890 is an apocalyptic number.

12239890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12239890 is a deficient number, since it is larger than the sum of its proper divisors (11486918).

12239890 is a wasteful number, since it uses less digits than its factorization.

12239890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94173.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 12239890 is about 3498.5554161682. Note that the first 3 decimals coincide. The cubic root of 12239890 is about 230.4583801271.

The spelling of 12239890 in words is "twelve million, two hundred thirty-nine thousand, eight hundred ninety".