1240928649 has 6 divisors (see below), whose sum is σ = 1792452506. Its totient is φ = 827285760.

The previous prime is 1240928609. The next prime is 1240928657. The reversal of 1240928649 is 9468290421.

It can be written as a sum of positive squares in only one way, i.e., 1240448400 + 480249 = 35220^2 + 693^2 .

It is not a de Polignac number, because 1240928649 - 2¹⁷ = 1240797577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1240928609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68940472 + ... + 68940489.

Almost surely, 2^1240928649 is an apocalyptic number.

It is an amenable number.

1240928649 is a deficient number, since it is larger than the sum of its proper divisors (551523857).

1240928649 is a wasteful number, since it uses less digits than its factorization.

1240928649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137880967 (or 137880964 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1240928649 is about 35226.8171852071. The cubic root of 1240928649 is about 1074.6051981642.

The spelling of 1240928649 in words is "one billion, two hundred forty million, nine hundred twenty-eight thousand, six hundred forty-nine".