1121904 has 120 divisors (see below), whose sum is σ = 3816720. Its totient is φ = 314496.

The previous prime is 1121899. The next prime is 1121933. The reversal of 1121904 is 4091211.

1121904 = T₂₇ + T₂₈ + ... + T₁₈₈.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21142 + ... + 21194.

It is an arithmetic number, because the mean of its divisors is an integer number (31806).

2^1121904 is an apocalyptic number.

1121904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1908360).

1121904 is an abundant number, since it is smaller than the sum of its proper divisors (2694816).

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

1121904 is a wasteful number, since it uses less digits than its factorization.

1121904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1121904 is about 1059.1996978852. The cubic root of 1121904 is about 103.9086969876.

It can be divided in two parts, 1121 and 904, that added together give a square (2025 = 45²).

The spelling of 1121904 in words is "one million, one hundred twenty-one thousand, nine hundred four".