1121400 has 144 divisors (see below), whose sum is σ = 4352400. Its totient is φ = 253440.

The previous prime is 1121389. The next prime is 1121423. The reversal of 1121400 is 41211.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12556 + ... + 12644.

It is an arithmetic number, because the mean of its divisors is an integer number (30225).

2^1121400 is an apocalyptic number.

1121400 is a gapful number since it is divisible by the number (10) 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 1121400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2176200).

1121400 is an abundant number, since it is smaller than the sum of its proper divisors (3231000).

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

1121400 is a wasteful number, since it uses less digits than its factorization.

1121400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1121400 is about 1058.9617556834. The cubic root of 1121400 is about 103.8931348042.

Adding to 1121400 its reverse (41211), we get a palindrome (1162611).

It can be divided in two parts, 1121 and 400, that added together give a square (1521 = 39²).

The spelling of 1121400 in words is "one million, one hundred twenty-one thousand, four hundred".