1453440 has 64 divisors (see below), whose sum is σ = 4638960. Its totient is φ = 387072.

The previous prime is 1453429. The next prime is 1453453. The reversal of 1453440 is 443541.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1453440² = 4224975667200, which contains 22 as substring.

It is a congruent number.

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, 1542 + ... + 2298.

2^1453440 is an apocalyptic number.

1453440 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 1453440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2319480).

1453440 is an abundant number, since it is smaller than the sum of its proper divisors (3185520).

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

1453440 is an equidigital number, since it uses as much as digits as its factorization.

1453440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 1453440 is about 1205.5869939577. The cubic root of 1453440 is about 113.2745562196.

Adding to 1453440 its reverse (443541), we get a palindrome (1896981).

The spelling of 1453440 in words is "one million, four hundred fifty-three thousand, four hundred forty".