1438561 has 4 divisors (see below), whose sum is σ = 1441300. Its totient is φ = 1435824.

The previous prime is 1438537. The next prime is 1438583. The reversal of 1438561 is 1658341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1658341 = 73 ⋅22717.

It can be written as a sum of positive squares in 2 ways, for example, as 921600 + 516961 = 960^2 + 719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438561 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1438501) 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, 306 + ... + 1723.

It is an arithmetic number, because the mean of its divisors is an integer number (360325).

2^1438561 is an apocalyptic number.

It is an amenable number.

1438561 is a deficient number, since it is larger than the sum of its proper divisors (2739).

1438561 is an equidigital number, since it uses as much as digits as its factorization.

1438561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738.

The product of its digits is 2880, while the sum is 28.

The square root of 1438561 is about 1199.4002668000. The cubic root of 1438561 is about 112.8866956278.

Adding to 1438561 its product of digits (2880), we get a palindrome (1441441).

The spelling of 1438561 in words is "one million, four hundred thirty-eight thousand, five hundred sixty-one".