1147440 has 80 divisors (see below), whose sum is σ = 4071168. Its totient is φ = 261888.

The previous prime is 1147427. The next prime is 1147441. The reversal of 1147440 is 447411.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1147441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1339 + ... + 2021.

2^1147440 is an apocalyptic number.

1147440 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 1147440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2035584).

1147440 is an abundant number, since it is smaller than the sum of its proper divisors (2923728).

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

1147440 is a wasteful number, since it uses less digits than its factorization.

1147440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 1147440 is about 1071.1862583137. The cubic root of 1147440 is about 104.6911559576.

The spelling of 1147440 in words is "one million, one hundred forty-seven thousand, four hundred forty".