1227440 has 40 divisors (see below), whose sum is σ = 2909040. Its totient is φ = 481536.

The previous prime is 1227437. The next prime is 1227463. The reversal of 1227440 is 447221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5246 + ... + 5474.

It is an arithmetic number, because the mean of its divisors is an integer number (72726).

2^1227440 is an apocalyptic number.

1227440 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 1227440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1454520).

1227440 is an abundant number, since it is smaller than the sum of its proper divisors (1681600).

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

1227440 is a wasteful number, since it uses less digits than its factorization.

1227440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1227440 is about 1107.8989123562. The cubic root of 1227440 is about 107.0697422867.

The spelling of 1227440 in words is "one million, two hundred twenty-seven thousand, four hundred forty".