12220290 has 24 divisors (see below), whose sum is σ = 31772988. Its totient is φ = 3258720.

The previous prime is 12220277. The next prime is 12220301. The reversal of 12220290 is 9202221.

It can be written as a sum of positive squares in 2 ways, for example, as 9979281 + 2241009 = 3159^2 + 1497^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 67801 + ... + 67980.

Almost surely, 2^12220290 is an apocalyptic number.

12220290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12220290 is an abundant number, since it is smaller than the sum of its proper divisors (19552698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12220290 is a wasteful number, since it uses less digits than its factorization.

12220290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135794 (or 135791 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12220290 is about 3495.7531377373. The cubic root of 12220290 is about 230.3353017485.

The spelling of 12220290 in words is "twelve million, two hundred twenty thousand, two hundred ninety".