1540280506 has 4 divisors (see below), whose sum is σ = 2310420762. Its totient is φ = 770140252.

The previous prime is 1540280473. The next prime is 1540280507. The reversal of 1540280506 is 6050820451.

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

It can be written as a sum of positive squares in only one way, i.e., 955366281 + 584914225 = 30909^2 + 24185^2 .

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 not an unprimeable number, because it can be changed into a prime (1540280507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385070125 + ... + 385070128.

Almost surely, 2^1540280506 is an apocalyptic number.

1540280506 is a deficient number, since it is larger than the sum of its proper divisors (770140256).

1540280506 is an equidigital number, since it uses as much as digits as its factorization.

1540280506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770140255.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 1540280506 is about 39246.4075553419. The cubic root of 1540280506 is about 1154.8704604131.

The spelling of 1540280506 in words is "one billion, five hundred forty million, two hundred eighty thousand, five hundred six".