1540280505 has 24 divisors (see below), whose sum is σ = 2600992512. Its totient is φ = 778244256.

The previous prime is 1540280473. The next prime is 1540280507. The reversal of 1540280505 is 5050820451.

It is not a de Polignac number, because 1540280505 - 2⁵ = 1540280473 is a prime.

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 in 23 ways as a sum of consecutive naturals, for example, 136809 + ... + 147638.

It is an arithmetic number, because the mean of its divisors is an integer number (108374688).

Almost surely, 2^1540280505 is an apocalyptic number.

1540280505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1540280505 is a deficient number, since it is larger than the sum of its proper divisors (1060712007).

1540280505 is a wasteful number, since it uses less digits than its factorization.

1540280505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284493 (or 284474 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 1540280505 is about 39246.4075426019. The cubic root of 1540280505 is about 1154.8704601632.

The spelling of 1540280505 in words is "one billion, five hundred forty million, two hundred eighty thousand, five hundred five".