1240755261 has 8 divisors (see below), whose sum is σ = 1654550400. Its totient is φ = 827065152.

The previous prime is 1240755221. The next prime is 1240755289. The reversal of 1240755261 is 1625570421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1240755261 - 2¹⁹ = 1240230973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240755211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7516 + ... + 50378.

It is an arithmetic number, because the mean of its divisors is an integer number (206818800).

Almost surely, 2^1240755261 is an apocalyptic number.

It is an amenable number.

1240755261 is a deficient number, since it is larger than the sum of its proper divisors (413795139).

1240755261 is an equidigital number, since it uses as much as digits as its factorization.

1240755261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52515.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 1240755261 is about 35224.3560764423. The cubic root of 1240755261 is about 1074.5551463140. Note that the first 3 decimals are identical.

The spelling of 1240755261 in words is "one billion, two hundred forty million, seven hundred fifty-five thousand, two hundred sixty-one".