1540260765 has 20 divisors (see below), whose sum is σ = 2761060764. Its totient is φ = 821472192.

The previous prime is 1540260739. The next prime is 1540260767. The reversal of 1540260765 is 5670620451.

It is a happy number.

1540260765 is a `hidden beast` number, since 1 + 5 + 40 + 2 + 607 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 939667716 + 600593049 = 30654^2 + 24507^2 .

It is not a de Polignac number, because 1540260765 - 2¹⁰ = 1540259741 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540260767) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1901152 + ... + 1901961.

Almost surely, 2^1540260765 is an apocalyptic number.

1540260765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1540260765 is a deficient number, since it is larger than the sum of its proper divisors (1220799999).

1540260765 is an equidigital number, since it uses as much as digits as its factorization.

1540260765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3803130 (or 3803121 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 1540260765 is about 39246.1560538099. The cubic root of 1540260765 is about 1154.8655265942.

It can be divided in two parts, 15402 and 60765, that added together give a palindrome (76167).

The spelling of 1540260765 in words is "one billion, five hundred forty million, two hundred sixty thousand, seven hundred sixty-five".