1213290 has 96 divisors (see below), whose sum is σ = 3656016. Its totient is φ = 276480.

The previous prime is 1213271. The next prime is 1213301. The reversal of 1213290 is 923121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 154449 + 1058841 = 393^2 + 1029^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19860 + ... + 19920.

2^1213290 is an apocalyptic number.

1213290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1828008).

1213290 is an abundant number, since it is smaller than the sum of its proper divisors (2442726).

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

1213290 is a wasteful number, since it uses less digits than its factorization.

1213290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1213290 is about 1101.4944393868. The cubic root of 1213290 is about 106.6567156516.

The spelling of 1213290 in words is "one million, two hundred thirteen thousand, two hundred ninety".