1456640 has 40 divisors (see below), whose sum is σ = 3498660. Its totient is φ = 581632.

The previous prime is 1456633. The next prime is 1456643. The reversal of 1456640 is 466541.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1364224 + 92416 = 1168^2 + 304^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1456643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2276 + ... + 2844.

2^1456640 is an apocalyptic number.

1456640 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 1456640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1749330).

1456640 is an abundant number, since it is smaller than the sum of its proper divisors (2042020).

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

1456640 is an frugal number, since it uses more digits than its factorization.

1456640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1456640 is about 1206.9134186014. The cubic root of 1456640 is about 113.3576264725.

Subtracting from 1456640 its reverse (466541), we obtain a palindrome (990099).

The spelling of 1456640 in words is "one million, four hundred fifty-six thousand, six hundred forty".