1122840 has 48 divisors (see below), whose sum is σ = 3650400. Its totient is φ = 299328.

The previous prime is 1122811. The next prime is 1122841. The reversal of 1122840 is 482211.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1200 + ... + 1919.

It is an arithmetic number, because the mean of its divisors is an integer number (76050).

2^1122840 is an apocalyptic number.

1122840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1122840 is an abundant number, since it is smaller than the sum of its proper divisors (2527560).

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

1122840 is a wasteful number, since it uses less digits than its factorization.

1122840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136 (or 3129 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1122840 is about 1059.6414487929. The cubic root of 1122840 is about 103.9375858246.

The spelling of 1122840 in words is "one million, one hundred twenty-two thousand, eight hundred forty".