1121890 has 64 divisors (see below), whose sum is σ = 2654208. Its totient is φ = 331200.

The previous prime is 1121867. The next prime is 1121899. The reversal of 1121890 is 981211.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1121899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23847 + ... + 23893.

It is an arithmetic number, because the mean of its divisors is an integer number (41472).

2^1121890 is an apocalyptic number.

1121890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1121890 is an abundant number, since it is smaller than the sum of its proper divisors (1532318).

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

1121890 is a wasteful number, since it uses less digits than its factorization.

1121890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1121890 is about 1059.1930891013. The cubic root of 1121890 is about 103.9082647677.

It can be divided in two parts, 112 and 1890, that added together give a palindrome (2002).

The spelling of 1121890 in words is "one million, one hundred twenty-one thousand, eight hundred ninety".