1540489 has 4 divisors (see below), whose sum is σ = 1631124. Its totient is φ = 1449856.

The previous prime is 1540481. The next prime is 1540499. The reversal of 1540489 is 9840451.

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: 9840451 = 41 ⋅240011.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 100489 = 1200^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540489 - 2³ = 1540481 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1540489.

It is not an unprimeable number, because it can be changed into a prime (1540481) 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, 45292 + ... + 45325.

It is an arithmetic number, because the mean of its divisors is an integer number (407781).

2^1540489 is an apocalyptic number.

It is an amenable number.

1540489 is a deficient number, since it is larger than the sum of its proper divisors (90635).

1540489 is an equidigital number, since it uses as much as digits as its factorization.

1540489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90634.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1540489 is about 1241.1643726759. The cubic root of 1540489 is about 115.4922566225.

It can be divided in two parts, 15 and 40489, that added together give a palindrome (40504).

The spelling of 1540489 in words is "one million, five hundred forty thousand, four hundred eighty-nine".