1122890 has 8 divisors (see below), whose sum is σ = 2021220. Its totient is φ = 449152.

The previous prime is 1122887. The next prime is 1122899. The reversal of 1122890 is 982211.

It can be written as a sum of positive squares in 2 ways, for example, as 1026169 + 96721 = 1013^2 + 311^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1122899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56135 + ... + 56154.

2^1122890 is an apocalyptic number.

1122890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1122890 is a deficient number, since it is larger than the sum of its proper divisors (898330).

1122890 is a wasteful number, since it uses less digits than its factorization.

1122890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112296.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1122890 is about 1059.6650414164. The cubic root of 1122890 is about 103.9391285800.

The spelling of 1122890 in words is "one million, one hundred twenty-two thousand, eight hundred ninety".