1216290 has 16 divisors (see below), whose sum is σ = 2919168. Its totient is φ = 324336.

The previous prime is 1216277. The next prime is 1216337. The reversal of 1216290 is 926121.

It is a super-2 number, since 2×1216290² = 2958722728200, which contains 22 as substring.

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, 20242 + ... + 20301.

It is an arithmetic number, because the mean of its divisors is an integer number (182448).

2^1216290 is an apocalyptic number.

1216290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216290 is an abundant number, since it is smaller than the sum of its proper divisors (1702878).

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

1216290 is a wasteful number, since it uses less digits than its factorization.

1216290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40553.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1216290 is about 1102.8553848987. The cubic root of 1216290 is about 106.7445503235.

The spelling of 1216290 in words is "one million, two hundred sixteen thousand, two hundred ninety".