1240109505 has 24 divisors (see below), whose sum is σ = 2150446272. Its totient is φ = 661107744.

The previous prime is 1240109503. The next prime is 1240109509. The reversal of 1240109505 is 5059010421.

1240109505 is a `hidden beast` number, since 12 + 40 + 109 + 505 = 666.

It is not a de Polignac number, because 1240109505 - 2¹ = 1240109503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240109503) 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, 139092 + ... + 147738.

It is an arithmetic number, because the mean of its divisors is an integer number (89601928).

Almost surely, 2^1240109505 is an apocalyptic number.

1240109505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240109505 is a deficient number, since it is larger than the sum of its proper divisors (910336767).

1240109505 is a wasteful number, since it uses less digits than its factorization.

1240109505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11845 (or 11842 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1240109505 is about 35215.1885555083. The cubic root of 1240109505 is about 1074.3686951336.

Adding to 1240109505 its reverse (5059010421), we get a palindrome (6299119926).

The spelling of 1240109505 in words is "one billion, two hundred forty million, one hundred nine thousand, five hundred five".