1491440 has 40 divisors (see below), whose sum is σ = 3520608. Its totient is φ = 587520.

The previous prime is 1491439. The next prime is 1491449. The reversal of 1491440 is 441941.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8150 + ... + 8330.

2^1491440 is an apocalyptic number.

1491440 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 1491440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1760304).

1491440 is an abundant number, since it is smaller than the sum of its proper divisors (2029168).

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

1491440 is a wasteful number, since it uses less digits than its factorization.

1491440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1491440 is about 1221.2452661116. The cubic root of 1491440 is about 114.2532586410.

The spelling of 1491440 in words is "one million, four hundred ninety-one thousand, four hundred forty".