1440653 has 4 divisors (see below), whose sum is σ = 1453980. Its totient is φ = 1427328.

The previous prime is 1440641. The next prime is 1440679. The reversal of 1440653 is 3560441.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3560441 = 647 ⋅5503.

It can be written as a sum of positive squares in 2 ways, for example, as 797449 + 643204 = 893^2 + 802^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440653 - 2⁶ = 1440589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6500 + ... + 6717.

It is an arithmetic number, because the mean of its divisors is an integer number (363495).

2^1440653 is an apocalyptic number.

It is an amenable number.

1440653 is a deficient number, since it is larger than the sum of its proper divisors (13327).

1440653 is a wasteful number, since it uses less digits than its factorization.

1440653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13326.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1440653 is about 1200.2720524948. The cubic root of 1440653 is about 112.9413902342.

The spelling of 1440653 in words is "one million, four hundred forty thousand, six hundred fifty-three".