1540754489 has 4 divisors (see below), whose sum is σ = 1631387124. Its totient is φ = 1450121856.

The previous prime is 1540754477. The next prime is 1540754503. The reversal of 1540754489 is 9844570451.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1385328400 + 155426089 = 37220^2 + 12467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540754489 - 2⁸ = 1540754233 is a prime.

It is a super-2 number, since 2×1540754489² = 4747848790747302242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540754689) 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, 45316292 + ... + 45316325.

It is an arithmetic number, because the mean of its divisors is an integer number (407846781).

Almost surely, 2^1540754489 is an apocalyptic number.

It is an amenable number.

1540754489 is a deficient number, since it is larger than the sum of its proper divisors (90632635).

1540754489 is an equidigital number, since it uses as much as digits as its factorization.

1540754489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90632634.

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 1540754489 is about 39252.4456435519. The cubic root of 1540754489 is about 1154.9889091468.

It can be divided in two parts, 15407 and 54489, that added together give a palindrome (69896).

The spelling of 1540754489 in words is "one billion, five hundred forty million, seven hundred fifty-four thousand, four hundred eighty-nine".